Making water rapidly in all holds,all passengers and crew were ordered on deck()and all boats were lowered to rail.
A. in life jackets
B. with life jackets
C. with life jackets on
D. putting on life jacket
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表单集包括表单和()。
A. 工具栏
B. 页框
C. 表格
D. 页面
()表示当前操作的表单。
A. THIS
B. THISFORM
C. ActiveForm
D. THISFORMSET
It's one of the best()I have ever been to.
A. concerts
B. a concert
C. the concert
D. concert
边界层分离的必要条件是()。
A. dp/dx<0;
B. dp/dx>0;
C. du/dy>0;
D. du/dx>0。