从结构工艺性里考虑哪个方案较好,并说明理由?
参考答案:
图A中孔太深,加工不方便,而图B结构中孔加工较容易。
He felt______ duty to work for human rights and progress.
A.it his
B.his
C.that is a
D.it is his
在闭环控制系统中,当实际转速低于怠速转速的稳定值时,点火提前角应()。
A、增大
B、减小
C、不变