修筑粘土前戗时,应根据()、堤前水深、漏水严重程度等因素确定前戗尺寸。
A.河道宽度
B.河道长度
C.堤防长度
D.漏水堤段范围
参考答案:D
根据所给词的适当形式填空。
1. It is the home page of one of the ______ (survive).
2. What city is Mrs Johns leaving for ______ her daughter tomorrow? (see)
3. The two girls ______ (trap) in the burning building.
4. He looked ______ (sad) at the broken toy car.
5. Can you hear the loud noise ______ (follow) lightning?
6. I ______ on the ice when you called me. (skate)
7. At the beginning of the ______ (twenty) century, the world's population was 1.7 billion.
8. I hope you _______ (not forget) to lock the door next time.
9. Bad weather sometimes causes _______ disasters. (nature)
10. Nobody but Mary and her sister _______ (know) where he is from.
推广使用安全套的措施,最适合的人群是()
A.大、中学生
B.社区居民
C.卖淫嫖娼者
D.老年人
E.以上都正确