试题与答案

It is sometimes necessary to moor bow and

题型:单项选择题

题目:

It is sometimes necessary to moor bow and stern to two mooring buoys in order to().

A.avoid any swing in a restricted space

B.prevent to touch with other vessels

C.make a convenience of cargo discharging

答案:

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参考答案:在种群中许多等位基因的存在导致一个种群中一种以上的表现型,这种现象叫做多型。

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