单选题Radiation spreads a fire by（）.Atransferring heat across an unobstructed spaceBheated gases flowing through ventilation systemsCburning liquids flowing into another spaceDtransmitting the heat of a fire through the ship's metal
单选题
Radiation spreads a fire by（）.
A
transferring heat across an unobstructed space
B
heated gases flowing through ventilation systems
C
burning liquids flowing into another space
D
transmitting the heat of a fire through the ship's metal
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Convection spreads a fire by ______.A.heated gases flowing through ventilation systemsB.the transfer of heat across an unobstructed spaceC.burning liquids flowing into another spaceD.transmitting the heat of a fire through the ship’s metal
Space is a dangerous place,not only because of meteors but also because of rays from the sun?and other stars.The atmosphere again acts as our protective blanket on earth.Light gets through,and?this is essential for plants to make the food which we eat.Heat,too,makes our environment endurable.Various kinds of rays come through the air from outer space,but enormous quantities of radiation from the sun are screened off.As soon as men leave the atmosphere they are exposed to this radiation.But their spacesuits or the walls of their spacecraft,if they are inside,do prevent a lot of radiation damage.Radiation is the greatest known danger to explorers in space.The unit of radiation is called"rein".Scientists have reason to think that a man can put up with far more radiation than 0.1 rem?without being damaged;the figure of 60 rems has been agreed on.The trouble is that it is extremely?difficult to be sure about radiation damage—a person may feel perfectly well,but the cells of his or?her sex organs may be damaged,and this will not be discovered until the birth of deformed(畸形的)children or even grandchildren.Missions of the Apollo flights have had to cross belts of high radiation?and,during the outward and return journeys,the Apollo crew accumulated a large amount of rems.So?far,no dangerous amounts of radiation have been reported,but the Apollo missions have been quite?short.We simply do not know yet how men are going to get on when they spend weeks and months?outside the protection of the atmosphere,working in a space laboratory.Drugs might help to decrease?the damage done by radiation,but no really effective ones have been found so far.We know from the passage that__A.exposure to even tiny amounts of radiation is fatalB.the effect of exposure to radiation is slow in comingC.radiation is avoidable in space explorationD.astronauts in spacesuits needn't worry about radiation damage
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