根据问句,单选合适的答句。(将合适的序号填在横线上)
A. How nice. B. OK. Let's go. C. Not so good. D. OK. Good night. E. Good morning.
行列式cos20°sin40°sin20°cos40°的值是____
下列运输任务与适宜的运输方式搭配,正确的是( )