Radar is used not only to look______，but also to measure their distances away from you．A.at obscured objectsB.forward submerged targetsC.up exposed targetsD.for unseen objects
Radar is used not only to look______，but also to measure their distances away from you．
A.at obscured objects
B.forward submerged targets
C.up exposed targets
D.for unseen objects
相关考题：
Dick was a sailor on a big ship. It went to Japan and Australia, __21__ Dick was often on the ship for several months at a time. When he woke up in the morning and looked out, he only saw the sea, __22__ sometimes a port.When he was twenty-four, Dick __23__ and bought a small house with a garden in his wife's town. It was far away fromthe sea. Then he had to go back to his ship, and he __24__ home for two months. He went from the port to the town by bus, and was very happy to see his wife again.The next morning he slept until 9 o'clock. Then he woke up suddenly and looked out of the window. There were trees a few feet __25__. He was very frightened and jumped out ofbed, shouting, "We've hit land!"21.A.orB.did not comeC.soD.got marriedE.away22.A.orB.did not comeC.soD.got marriedE.away23.A.orB.did not comeC.soD.got marriedE.away24.A.orB.did not comeC.soD.got marriedE.away25.A.orB.did not comeC.soD.got marriedE.away
某企业职工关系EMP(E_no，E_name，DEPT，E_addr，E_tel)中的属性分别表示职工号、姓名、部门、地址和电话；经费关系FUNDS(E_no,E_limit，E_used)中的属性分别表示职工号、总经费金额和己花费金额。若要查询部门为"开发部"且职工号为"03015"的职工姓名及其经费余额，则相应的SQL语句应为: SELECT(60) FROM(61) WHERE(62)A.EMP.E_no,E_limit-E_usedB.EMP.E_name,E_used-E_limitC.EMP.E_no,E_used-E_limitD.EMP.E_name,E_limit-E_used
Hearing the dog barking fiercely, away ______.A. fleeing the thief B. was fleeing the thief C. the thief was fleeing D. fled the thief
共用题干第二篇Home HeatingCentral heating became popular only after the Civil War.Typically,coal-burning furnaces（火炉）fueled the early systems.Natural gas had developed into the leading fuel by 1960.Its acceptance resulted in part from its wide uses.Because it comes primarily from U.S.and Canadian fields , natural gas is also less vulnerable（脆弱的）than oil is to war.Oil remains the most important fuel in a few areas,such as New England.Electric heating dominates most areas with mild winters and cheap electricity,including the South and the Northwest.It was made popular at least in the South by the low cost of adding electric heating to new houses built with air-conditioning.Bottled gas,which is somewhat more expensive than utility gas,is the fuel of choice in rural areas not served by utility pipelines.Wood is the leading heating fuel in just a few rural counties.Home heating,which accounts for less than 7 per cent of all energy consumed in the U.S.,has had a commendable（值得赞扬的）efficiency record : from 1 978 to 1 997 , the amount of fuel consumed for this purpose declined 44 per cent despite a 33 per cent increase in the number of housing units and an increase in house size.TheU.S.Department of Energy,however,forecasts that energy used in home heating will rise by 14 per cent over the next two decades.That rise is small considering an expected 21 per cent increase in the number of houses and the trend toward larger houses.Natural gas and electricity will probably dominate the home heating market for the next two decades.Solar（太阳的）heating never became popular because of cost and limited winter sunlight in most areas;in 2000 only 47,000 homes relied on it.The word "consumed" in paragraph 3 could be best replaced byA:used.B:burned.C:delivered.D:pumped.
某企业职工关系EMP（E_no，E_name，DEPT，E_addr，E_tel）中的属性分别表示职工号、姓名、部门、地址和电话；经费关系FUNDS（E_no，E_limit，E_used）中的属性分别表示职工号、总经费金额和己花费金额。若要查询部门为"开发部"且职工号为"03015"的职工姓名及其经费余额，则相应的SQL语句应为:SELECT（请作答此空）FROM（ ）WHERE（ ）A.EMP.E_no,E_limit-E_usedB.EMP.E_name,E_used-E_limitC.EMP.E_no,E_used-E_limitD.EMP.E_name,E_limit-E_used
有效的措施 an ______________ measure