Strength of timber is affected by four main factors, they are()、()、()、()
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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
头部骨骼可分为( )。
A. 颧骨和鼻骨
B. 大脑
C. 面部
D. 脑颅和面颅