氧化开车前环氧吸收岗位()。
A、不用水运
B、吸收塔为空塔高低压隔离
C、环氧吸收岗位已经水运
D、贫吸收液冷却器不用投用
参考答案:C
She ____a smile when she heard her family went to Italwithout her. [ ]
A. wore
B. managed
C. performed
D. controlled
()是在镗床上进行单孔镗削的最后加工工序。
A.粗镗
B.半精镗
C.精镗
D.组合镗