在使用活扳手时，应让固定钳口受（）作用力。
A、主要
B、重要
C、次要
D、紧要
参考答案：A
— He is eager to try something he has never tried before.
— Oh, I see. That's _____ he's different from others. [ ]
A. when
B. where
C. how
D. what
乳腺癌第Ⅰ期相当于（）。
A.T1N0M0
B.T1N1M0
C.T2N0M0
D.T2N1M0
E.T3N1M0
