阀门填料函泄漏的原因包括()。
A.装填填料方法不正确
B.填料老化
C.露天阀门锈死
D.关闭不当
参考答案:A, B, D
–Who should be responsible for the accident?
-The boss, not the workers. They just carried out the order .
A.as told
B.as are told
C.as telling
D.as they told
在竞相修建超高层建筑的热潮中,渥尔华斯公司大楼曾是1908年世界第一高楼。