将胶片装入石灰箱内密闭闷的作用是( )
A.避免成品塌顶B.促进胶块内部化学反应C.使内部水分向胶块表面扩散D.闷胶时用石灰杀菌E.便于印字
参考答案:C
We discussed where to go for a whole morning, but we decided to stay at home _____. [ ]
A. at the end
B. by the end
C. in the end
D. on end
牵伸过程中纤维与纤维之间、纤维与牵伸装置机件之间的摩擦力存在的空间称为()