"On no account ____to feed the animals", the warning can be seen on the signboard in front of every cage.

A．allow visitors

B．visitors are allowed

C．are visitors allowed

D．are allowed visitors

小油机维护管理资料都有哪些（）

A.月检表格

B.维护清单表格

C.故障抢修表格

D.领用与归还表格