当风力达到（）级以上时，受风面积较大的物体不宜起吊。
A.4
B.5
C.6
参考答案：B
What would you like? [ ]
A. I'd like some beef.
B. Let me try.
C. Help yourself.
非确定型决策有很大的( )随意性。
A．主观
B．客观
C．微观
D．宏观
