当海面涌浪较大或有()横风时,船舶不宜进入冰区。
A.2级以上
B.3级以上
C.4级以上
D.5级以上
参考答案:D
—How many people went to the party?
—_____ people. [ ]
A. Two thousands
B. Thousand of
C. Thousands of
D. Two thousand of
汽油中含有()组分不会造成铜片腐蚀不合格。
A、硫醇
B、芳烃
C、有机酸
D、水溶性酸碱