()可分为件杂货船,集装箱船,滚装船,冷藏船,多用途船,干散货船。
参考答案:干货船
Lucy and Lily ______ my sisters. [ ]
A. aren't
B. isn't
C. is
D. not
起重吊装操作中用得最广泛的绳索是()。
A.麻绳
B.钢丝绳
C.尼龙绳
D.涤纶绳