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问题
单项选择题
警戒水位是指江河漫滩行洪、堤防可能发生()险情、需要开始巡堤查险、加强防守时的水位。
A、险情
B、重大险情
C、损毁
答案
参考答案:A
选择题
I _____ you not to give up that job now, where can you find a better one?
A. told
B. were telling
C. had told
D. tell
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问答题 简答题
什么是GlS?
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