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【简答题】
设z＝xy，则dz＝__________．
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举一反三
【单选题】Fuel oil tanks must be fitted with ____ that can be closed rapidly and remotely in the event of an emergency such as a fire
A.
stop valves
B.
non-return valves
C.
quick closing valves
D.
relief valve
【单选题】词汇与结构 Prior to V 1 , a takeoff should be _______ in the event of critical failures such as engine fire, unsafe configuration and any adverse condition significantly affecting the safety of flight.
A.
refused
B.
suspended
C.
stopped
D.
rejected
【单选题】当发动机转速一定，负荷增加时（在中小负荷范围内）（）。
A.
汽油机指示油耗率增加，柴油机指示油耗率减小
B.
汽油机指示油耗率增加，柴油机指示油耗率增加
C.
汽油机指示油耗率减小，柴油机指示油耗率增加
D.
汽油机指示油耗率减小，柴油机指示油耗率减小
【单选题】当发动机转速一定，负荷增加时（）。
A.
汽油机充气效率增加，柴油机充气效率基本不变
B.
汽油机充气效率减小，柴油机充气效率增加
C.
汽油机充气效率减小，柴油机充气效率基本不变
D.
汽油机充气效率增加，柴油机充气效率减小
【单选题】The system includes various safety devices such as ______ and ______ which can be closed in the event of a fire.
A.
booster pump ,viscosity regulator
B.
low-level alarm ,booster pump
C.
remotely operated tank outlet valves ,viscosity regulator
D.
low-level alarm ,remotely operated tank outlet valves
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