单项选择题

物体带电是由于( )。 A.
失去电荷或得到电荷的缘故 B.
既未失去电荷也未得到电荷的缘故 C.
由于物体是导体 D.
由于物体是绝缘体。

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Which of the following regarding AUSREP is false?

A．A vessel position-reporting system similar to AMVER.
B．It is a compulsory system.
C．It is operated by the Austrian Authorities.
D．It is an active system which means when vessels send position overdue, Search and Rescue units ashore will take actions to connect with them.

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属于上消化道的器官是（）。 A.
空肠 B.
回肠 C.
盲肠 D.
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