单项选择题

下列蔬菜种子属于植物学上的种子的是

A．黄瓜
B．莴苣
C．生姜
D．芹菜

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单项选择题

A bar magnet is held in a vertical orientation above a loop of wire that lies in the horizontal plane as shown in Figure OQ31.7. The south end of the magnet is toward the loop. After the magnet is dropped, what is true of the induced current in the loop as viewed from above?

沿线设施损坏分为防护设施缺损、隔离栅损坏、标志缺损和标线缺损共四类。

答案：错误