斗轮堆取料机的斗轮转速为()。
A.6.5r/min
B.7.5r/min
C.8.5r/min
参考答案:A
Having retired from business,he now himself with the welfare of the disabled
and lives a meaningful life. [ ]
A.associates
B.occupies
C.charges
D.rewards
中共第一所培养革命干部的学校是?