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【判断题】
旅行社产品设计应以相对较低的成本,获取相对较高的效益遵循的是独特性原则。A.
正确
B.
错误
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举一反三
【简答题】有一批半径为1cm的球,为了提高球面的光洁度,要镀上一层铜,厚度定为0.01cm,估计每只球需用铜 g 。(计算结果保留2位小数,铜的密度是 )
【单选题】A circuit breaker differs from a fuse in that a circuit breaker
A.
melts and must be replaced
B.
is enclosed in a tube of insulating material with metal ferrules at each end
C.
gives no visual indication of having opened the circuit
D.
trips to break the circuit and may reset
【单选题】Ice-breaker assistance for convoy will start at 1930 UTC.
A.
Ice-breaker assistance for fleet passage started at 1930 UTC.
B.
Ice-breaker assistance for fleet passage is due to start at 1930 UTC.
C.
Ice-breaker assistance for M.V. Convoy started at 1930 UTC.
D.
Ice-breaker assistance for M.V. Convoy is due to start at 1930 UTC.
【简答题】有一批半径为 1cm 的球 , 为了提高球面的光洁度 , 要镀上一层铜 , 厚度定为 0 . 01cm . 估计一了每只球需用铜多少 g ( 铜的密度是 8. 9g/cm 3 )?
【单选题】Ice-breaker assistance for convoy will start at 1930UTC
A.
Ice-breaker assistance for fleet passage stared at 1930UTC
B.
Ice-breaker assistance for fleet passage is due to start at 1930UTC
C.
Ice-breaker assistance for M.V. Convoy started at 1930UTC
D.
Ice-breaker assistance for M.V. Convoy is due to start at 1930UTC
【单选题】A circuit breaker differs from a fuse in that a circuit breaker （）.
A.
melts and must be replaced
B.
is enclosed in a tube of insulating material with metal ferrules at each end
C.
gives no visual indication of having opened the circuit
D.
trips to break the circuit and may be reset
【单选题】The purpose of a main switchboard circuit breaker's reverse power trip is to _____.
A.
prevent main circuit overload
B.
protect the circuit breaker blowout coil
C.
prevent alternator motorization
D.
prevent low voltage tripout
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