道岔的制作标准要求:尖轨跟部轨距加宽递减,直股的递减率不大于()。
A、2‰
B、4‰
C、1‰
D、3‰
参考答案:D
We shouldn’t be too crazy about learning English, but it is also too______to give up English classes in schools.
A.extreme
B.upset
C.stubborn
D.willing
斗争是绝对的,因为它不需要任何条件。( )