试题与答案

The Flinders bar and the quadrantal sphere

题型:单项选择题

题目:

The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval().

A.They are not subject to permanent magnetism; no check is necessary

B.Semiannually

C.Annually

D.Every five years

答案:

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参考答案:芽的特性:有异质性,早熟性和晚熟性,萌芽力和成枝力,潜伏力;意义:嫁接用,更新用。

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