杠杆式结构属于截止阀的一种。
参考答案:错
— Do you mind if I open the window?
— _______ I feel a bit cold.
[ ]
A. Of course not.
B. Go ahead.
C. I'd rather you didn't.
D. Why not?
用燀法炮制的药材是()
A.苦杏仁
B.麦芽
C.半夏
D.川乌
E.木香