化学膨松面坯中,臭粉的正常用量一般为 ()左右。
A. 0.7%
B.1.5%
C. 2%
D.3%
参考答案:A
—Did you receive the letter the next day?
—No. Somehow, it was three weeks ________ I received it.
A.since
B.before
C.that
D.when
无空重车调整装置之车辆最大制动率是按照()确定的。
A、重车紧急制动,且车速在5~10km/h条件下
B、空车紧急制动,且车速减到5~10km/h条件下
C、空车常用制动,且车速减到5~10km/h条件下
D、空车紧急制动,且车速在最高时速条件下