喷煤中速磨液压站压力设定7—9MPa。

工业企业以对冲平仓方式了结非套保商品期货合约时，发生的平仓盈亏应当确认为()

A.投资收益

B.期货损益

C.营业外收支

D.其他业务收支

(2013·高考福建卷)—Would you mind answering some questions on shopping habits?

— ________.

A．Yes，with great pleasure

B．No，I am afraid I can’t make it

C．Yes，it is worth the time

D．No，as long as it doesn’t take long

The girl in the classroom ______ be Maria. She called me from the library just now.

A．mustn't

B．may not

C．can't

D．needn't

乳牙最适宜进行根管治疗的时间是（）

A.乳牙萌出后

B.乳牙牙根形成至牙根开始吸收

C.乳牙根刚刚开始吸收

D.恒牙根形成1／2

E.恒牙牙冠形成

采用锚杆支护时，锚杆必须用（）或（）拧紧，确保锚杆的（托盘（板））紧贴巷壁。

A、机械

B、力矩扳手

C、扳手