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问题 单项选择题

莪术的药用部位为（）

A．根

B．根茎

C．根及根茎

D．块根

E．块茎

答案

参考答案：B

解答题

封闭图形______就是这个图形的周长．
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单项选择题

Your vessel has been damaged and is taking on water，but you do not require immediate assistance. You would preface a message advising other vessels of your situation with（）.

A.Mayday-Mayday-Mayday

B.Pan-Pan (3 times)

C.Securite-Securite-Securite

D.SOS-SOS-SOS
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