孔型中的圆角作用就是为了使角部冷却快些。
参考答案:错
-I think you'd better type this letter again before Mr. Smith sees it.
-Oh,dear!__________[ ]
A. Who cares?
B. No problem.
C.I don't mind at all.
D. Is it as bad as that?
公共管理绩效评估的主要问题。