预聚物干燥时()以及预聚物的保护等几点必须严格检查。
A.操作时间的控制
B.干燥温度的控制
C.於浆的倒空
D.干燥预聚物的处理
参考答案:A, B, C, D
The examination will begin at 10:30. Those who come late ____ to the examination room.[ ]
A. have not been admitted
B. don't admit
C. will not be admitted
D. didn't admit
电力系统一般检修的停电操作程序是怎样的?