检修管路时，应在相应阀门处（）
A.悬挂“禁动”警告牌
B.用链条锁住阀
C.用铁丝扎住阀
D.A＋B＋C
参考答案：D
Tom still thinks that The Hurt Locker is ________ Avatar.
A．as a great as
B．as great film as
C．as great a film as
D．so great a film as
农民为庄稼施肥，主要为植株生长提供含______、______、_______的无机盐。
