以标准试件测得,木材顺纹的抗拉强度是各种强度的最高值,约为顺纹抗压强度的()倍。
A、1~2
B、2~3
C、3~4
D、4~5
参考答案:B
Lilei was late for class yesterday ________ the heavy traffic.
A. because of B. because C. so
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