为保证脚手架立杆的安全、使用、，规范规定对其计算内容应有（）。
A、抗压强度
B、稳定性
C、容许长细比
D、抗弯强度
E、抗剪强度
参考答案：B, C
公墓墓位占地面积有哪些规定？
Risk of collision may be deemed to exist（）.
A.if the compass bearing of an approaching vessel does not appreciably change
B.even when an appreciable bearing change is evident, particularly when approaching a vessel at close range
C.if you observe both sidelights of a vessel ahead for an extended period of time
D.All of the above
