湿法制颗粒压片时,干颗粒中20~30目的粉粒应控制在()
A.5%以下
B.5%~10%
C.10%~20%
D.20%~40%
E.40%~60%
参考答案:D
That was so serious a matter that I had no choice but _____ the police.
A.called in
B.calling in
C.call in
D.to call in
带电高处作业是指()条件下进行的高处作业。
A.在接近电体
B.在接触带电体
C.在接近和接触带电体
D.都不对