多选题If p and q are primes greater than 2, which of the following statements must be true? (Indicate all such statements.)Ap + q is evenBpq is oddCp2-q2 is even
多选题
If p and q are primes greater than 2, which of the following statements must be true? (Indicate all such statements.)
A
p + q is even
B
pq is odd
C
p2-q2 is even
参考解析
解析：
由于所有大于2的质数都是奇数，因此p和q均是奇数，两奇数相加为偶数，所以A项正确；两奇数的乘积还是奇数，所以B项正确；两奇数的平方还各自是奇数，而两奇数的平方之差是偶数，因此C项也正确；所以选择A、B、C三项。
由于所有大于2的质数都是奇数，因此p和q均是奇数，两奇数相加为偶数，所以A项正确；两奇数的乘积还是奇数，所以B项正确；两奇数的平方还各自是奇数，而两奇数的平方之差是偶数，因此C项也正确；所以选择A、B、C三项。
相关考题：
18 Which of the following statements about accounting ratios and their interpretation are correct?1 A low-geared company is more able to survive a downturn in profit than a highly-geared company.2 If a company has a high price earnings ratio, this will often indicate that the market expects its profits to rise.3 All companies should try to achieve a current ratio (current assets/current liabilities) of 2:1.A 2 and 3 onlyB 1 and 3 onlyC 1 and 2 onlyD All three statements are correct
12 Which of the following statements are correct?(1) Contingent assets are included as assets in financial statements if it is probable that they will arise.(2) Contingent liabilities must be provided for in financial statements if it is probable that they will arise.(3) Details of all adjusting events after the balance sheet date must be given in notes to the financial statements.(4) Material non-adjusting events are disclosed by note in the financial statements.A 1 and 2B 2 and 4C 3 and 4D 1 and 3
Which of the following statements is true?A．The volume of deals for hedging purposes is much higher than that for arbitraging and speculative purposes.B．The foreign exchange business for commerce and tourism must be done before 11a.m.on 2 January.C．It is hedgers' money that drives much larger volume of other transactions.D．None of the above.
Which of the following is/are TRUE regarding lashing requirements to secure vehicles aboard Ro-Ro vessels?A.The securing of cargo on flats and trailers and in containers must be adequate to withstand both road and sea motionsB.The generally recommended lash angle cannot be greater than 45 degrees relative to the deck in any directionC.It is necessary for an adequate number of securing points on the vehicles themselves in order that lashings may be properly and safely utilizedD.All the above
Which of the following statements is TRUE regarding lashing requirements to secure vehicles aboard Ro-Ro vessels?A.The securing of cargo on flats and trailers must be adequate to withstand road motions onlyB.The movements experienced by road borne cargo are the same as the movements of a ship at seaC.The generally recommended lash angle is no greater than 45 degrees relative to the deck in any directionD.It is not necessary for an adequate number of securing points on the vehicles themselves since setting the brakes is sufficient
Which of the following statements is TRUE about the primary system dump device?（）A、 It is shared. B、 It must be /dev/hd6. C、 It must be an internal disk. D、 It can be an external device.
Which statement is true regarding the INTERSECT operator?（）A、It ignores NULL values B、Reversing the order of the intersected tables alters the result C、The names of columns in all SELECT statements must be identical D、The number of columns and data types must be identical for all SELECT statements in the query
A switch port on TK1 is being configured to support 802.1Q trunking. Which of the following are true about 802.1Q trunking？（）A、Both switches must be in the same VTP domain.B、The encapsulation type of both ends of the trunk does not have to match.C、The native VLAN on both ends of the trunk must be VLAN 1.D、802.1Q trunking can only be configured on a Layer 2 port.E、In 802.1Q trunking， all VLAN packets are tagged on the trunk link， except the native VLAN.
Which of the following statements is true regarding implementing Live Partition Mobility on two existing POWER6 based systems?（）A、The systems must use internal storage for boot purposes. B、All virtualized ethernet adapters must be numbered below 10. C、The mobile partition's network and disk access must be virtualized. D、Each system must be controlled by a different Hardware Management Console (HMC).
单选题The skulls and pelvic bones of some species of dinosaur share characteristics with the skulls and pelvic bones of all modern birds. Even though not all dinosaurs have these characteristics, there are scientists who claim that all animals that do have these characteristics are dinosaurs. If the statements above and the claim of the scientists are true, which of the following must also be true?ABirds share more characteristics with dinosaurs than they do with other animals.BSome ancient dinosaurs were indistinguishable from modern birds.CAll animals whose skulls share the characteristics of those of modern birds also have pelvic bones that are similar to those of modern birds.DModern birds are dinosaurs.EAll dinosaurs are birds.
多选题If x and y are both positive even integers, which of the following expressions must be even? (Select all such expressions.)AxyB(x+1)yCx(y+1)
多选题Concerning the figure below, if a =b, which of the following statements must be true? (Indicate all such statements.)Ac=dBl and k are parallelCm and l are perpendicular
多选题Which of the following statements are true? (Indicate all such statements.)Aτ(5) =τ(7)Bτ(5) τ(7) =τ(35)Cτ(5) + τ(7) =τ(12)
单选题If remote-controlled cars are more expensive than mechanical cars, and radio-controlled cars are more expensive than remote-controlled cars, which of the following statements must be true?AMechanical cars are the most expensive.BRadio-controlled cars are the most expensive.CRadio-controlled cars are cheaper than remote-controlled cars.DMechanical cars are more expensive than remote-controlled cars.
单选题An isosceles triangle has one angle with a measure greater than 95° and another with a measure of x°. Which of the following must be true?Ax 85Bx = 85Cx =42.5Dx 42.5Ex 42.5
单选题Which of the following statements is true concerning carbon dioxide when used as a fire extinguishing agent?（）ACarbon dioxide is corrosive when exposed to fireBCarbon dioxide should be applied slowly to a large engine room fireCIts total cooling effect is far greater than waterDIts smothering effect is excellent for class B fires
单选题Which of the following is true according to the passage?ANot all the fires in the forests must be put out.BPeople‘s carelessness leads to dangerous fires.CAustralia allows all the fires to burn naturally.DThere are more fires in Russia than in the USA.
多选题Given two different character sets (A and B), which of the following must be true for A to be considered a strict superset of B?（）AA must contain all of the characters defined in BBA must be UnicodeCThe encoded values in A must match the encoded values in B for all characters defined in BDA must be a multibyte character setEThe encoded values in A must match the encoded values in B for all numeric and alphabetic characters in B
单选题Which of the following statements is true concerning an oil cooler?（）AThe oil temperature is less than the cooling water temperatureBThe oil pressure is less than the cooling water pressureCThe oil pressure is greater than the cooling water pressureDThe oil flow control valve is always installed in the oil input line
单选题Which statement is true regarding the INTERSECT operator?（）AIt ignores NULL values BReversing the order of the intersected tables alters the result CThe names of columns in all SELECT statements must be identical DThe number of columns and data types must be identical for all SELECT statements in the query
问答题If M is a set of five numbers p, q, r, s and t, is the range of numbers in M greater than 5? (1) The average (arithmetic mean) of p, q, r, S, and t is 5. (2) p-r5.
单选题A switch port on TK1 is being configured to support 802.1Q trunking. Which of the following are true about 802.1Q trunking？（）ABoth switches must be in the same VTP domain.BThe encapsulation type of both ends of the trunk does not have to match.CThe native VLAN on both ends of the trunk must be VLAN 1.D802.1Q trunking can only be configured on a Layer 2 port.EIn 802.1Q trunking， all VLAN packets are tagged on the trunk link， except the native VLAN.
多选题Which two statements are true about MLP interleaving? （）AIt fragments and encapsulates all packets in a fragmentation header.BPackets smaller than the fragmentation size are interleaved between the fragments of the larger packets.CPackets larger than the fragmentation size are always fragmented, and cannot be interleaved, even if the traffic is voice traffic.DIt fragments and encapsulates packets that are longer than a configured size, but does not encapsulate smaller packets inside a fragmentation header.
单选题According to the passage, which of the following is true?APeople in allocations are unwilling to conform to a general pattern.BConformity is a special characteristic of business.CBusinessmen are all original thinkers.DBusinessmen are provided with greater opportunities than people in other professions.