空心墩按壁厚分为厚壁与薄壁，其中t/D（）为厚壁。
A．≥1/10
B．≥1/8
C．≤1/12
D．≤1/6
参考答案：A
No children to watch this kind of movie because it's too scary. [ ]
A. should allow
B. shouldn't be allowed
C. should be allowed
D. don't allow
木板和木格栅的木材的含水率应（）。
A、小于12%
B、10%~12%
C、小于10%
D、12%~15%
