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【单选题】
规范经济学回答的是( )的问题。A.
应该是什么
B.
是什么
C.
本该是什么
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反馈参考答案：
举一反三
【单选题】_____ first voyage of the ship ---- Titanic was not ______ success.
A.
The, a
B.
A, a
C.
A, the
D.
The, the
【单选题】Which statement about the dangerous cargo manifest，carried on a ship，is TRUE ________．
A.
The manifest must be made up by the Master or other designated ship's officer
B.
Shipments of hazardous and non-hazardous cargo may be listed on the manifest if they are destined for the same consignee
C.
The manifest must be kept in a designated holder on or near the bridge
D.
The type of label（s）required for each cargo must be indicated
【单选题】Logbooks are used to record the events occurring when ______.
A.
the ship is in a harbor
B.
the ship is at anchorage
C.
the ship is underway
D.
all of the above
【单选题】The Captain ordered the dangerous cargo on deck ______ to lighten the ship and minimize the risk at sea．
A.
Be jettisoned
B.
Be dropped
C.
Be dived
D.
Be abandoned
【单选题】用户设备需输入 PLC 的各种控制信号,通过 ( ) 将这些信号转换成中央处理器能够接受和处理的信号。
A.
CPU
B.
输出接口电路
C.
输入接口电路
D.
EEROM
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