公称压力为2.45MPa的阀门属于（）
A.低压门
B.中压门
C.高压门
D.超高压门
参考答案：B
我有时做事胆子很小
A．是
B．否
The good result____ the correct methods, that is to say,correct methods the good result. [ ]
A. lies; lead
B. lead to; lie in
C. lies in; lead to
D. lies to; lead to
