桁架结构杆件轴线交点错位的允许偏差最大限值是（）mm。
A.1
B.2
C.3
D.4
参考答案：C
You ________ cross the road when the traffic lights are red. [ ]
A. mustn't
B. can't
C. may not
D. don't
蚕矢汤功效与作用
