皮皮学，免费搜题
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【单选题】
现代民用飞机当主电源为直流电源时，二次电源的变换器件是A.
变压整流器
B.
静止变流器
C.
旋转变流机
D.
蓄电池
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【单选题】The term flood current refers to that time when the water ().
A.
is flowing towards the land
B.
is moving towards the ocean
C.
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D.
level is rising because of heavy rains
【单选题】To prevent flooding in winter the water flowing from the dam is constantly ____ by a computer.
A.
managed
B.
monitored
C.
graded
D.
conducted
【单选题】To prevent flooding in winter the water flowing from the dam is constantly ______ by a computer.
A.
graded
B.
managed
C.
conducted
D.
monitored
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