机上灭火时三人灭火小组的每个人的职责是（）.
A.一名负责灭火
B.一名安抚旅客
C.一名负责通讯联络
D.一名负责援助
参考答案：A, C, D
Percy Bysshe Shelley is one of the leading ______ poets, an intense and original lyrical poet in the English language.
A. realistic B. symbolicC. romantic D. imagist
在水泵中填料是用于密封（）之间间隙的材料.
A.叶轮与泵轴
B.叶轮与泵壳
C.泵轴与轴承
D.泵轴与泵壳
