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。