坝基渗漏
参考答案：
上游水流通过坝基的透水层，从下游坝脚或坝脚以外覆盖层的薄弱部位逸出，造成坝后管涌、流土和沼泽化。
句型转换。
1. There are some flowers in Rebecca's room. (否定句)
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2. He likes fishing. (一般疑问句)
3. I can play tennis with a racket. (对划线部分提问)
4. Do you have any uncles? (否定回答)
5. May I take your order? (肯定回答)
座汤又名（）。
A.首汤
B.尾汤
C.饭汤
D.跟汤
