从事非拖网作业的船舶在航不对水移动在雾中应鸣放的声号是:().
A.一长声
B.两长声
C.一长两短声
D.五短声
参考答案:C
This college allows students to develop their own interests, to ______extent they wished. [ ]
A. whoever
B. whatever
C. however
D. whenever
现代天气业务的主要特征是:以(),以及综合应用各类气象观测资料。
A.数值预报为基础
B.细网格
C.精细化
D.无缝隙
E.时间和空间上无缝隙