进出口食品标签审核适用于对进出口（）食品标签的审核、检验管理。
A．内包装
B．预包装
C．外包装
D．固定包装
参考答案：B
简述磁放大器的工作原理？
If an emergency pump control is used as the emergency shutdown on a tanker，it must（）.
A.stop the flow of oil at the main deck manifold
B.prevent the oil from leaving the shore facility
C.prevent the oil from siphoning through the pump
D.None of the above
