适宜的衡量频度取决于控制活动的()
A、类型
B、对象
C、目的
D、性质
参考答案：D
— Will the match be cancelled because of the bad weather?
— No. Rain or shine, the match will be held as ______.[ ]
A. schedule
B. scheduling
C. scheduled
D. to schedule
精馏塔的筛板由（）、（）、（）组成。
