汽车装运气瓶时，气瓶一般应（）放置，头部朝向一方，装车高度（）超过车厢高度。
A. 横向；不得
B. 横向；可以
C. 竖向；不得
D. 竖向；可以
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Onaclear，warmday，younoticetheapproachofatallcumuluscloud.Thecloudtophashardwelldefinededgesandrainisfallingfromthedarkloweredge.Shouldthiscloudpassdirectlyoverhead（）.
A. itwillbeprecededbyasuddenincreaseinwindspeed
B. itwillbeprecededbyasuddendecreaseinwindspeed
C. thewindspeedwillnotchangeasitpasses
D. thewindwillbackrapidlytoleftinacounterclockwisedirectionasitpasses
Thewaterinanauxiliaryboilershouldbetesteddailyfor（）.
A. dissolvedoxygen
B. chlorides
C. sludge
D. dissolvednitrogen
日本旧石器时代所处的社会组织形态是（）。
A. 原始群向母系氏族公社过渡的状态
B. 原始群向父系氏族公社过渡的状态
C. 母系氏族公社向父系氏族公社过渡的状态
D. 父系氏族公社向母系氏族公社过渡的状态
Lubeoilpumpstakingsuctionfromthesumpofmostsmallmarineenginesareusually（）.
A. ofthediaphragmtype
B. ofthecentrifugaltype
C. ofthepositivedisplacementtype
D. independentlydrivenbyelectricmotors
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