题目内容

The principal characteristics of timber are()、()、()

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Strength of timber is affected by four main factors, they are()、()、()、()

The endwise strength of timber is much stronger than the band strength.

A. 对
B. 错

The endwise strength of timber means that the load resistance across the grain.

A. 对
B. 错

头部的额头的骨头叫( )。

A. 顶骨
B. 颧骨
C. 额骨
D. 颞骨

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