下述对土石坝护坡范围的说法中（）不正确。（） A.上游护坡面上

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问题单项选择题

下述对土石坝护坡范围的说法中（）不正确。（）

A.上游护坡面上部应自坝顶起

B.上游护坡面下部应至死水位止

C.下游护坡面上部应自坝顶起

D.下游护坡面下部应至排水棱体或坝脚止

答案

参考答案：B

选择题

Read and guess.(看句子，猜谜语)

1. It's an animal. It lives in Australia. It lives in trees. It's _____. [ ]

A. a kangaroo

B. a koala

C. a monkey

2. It's a place. Our parents always go there at the weekend. We buy many things from it. It's a _____.

A. supermarket

B. park

C. library

3. When do we use umbrella and boots? It's _____.

A. rainy

B. sunny

C. windy

4. It's a thing. When you go on a trip and take some pictures, you will take it. It's a _____. [ ]

A. tent

B. umbrella

C. camera

5. What has hands but no feet, a face but no eyes, tells but does not talk? It's a _____ . [ ]

A. table

B. blackboard

C. clock

不定项选择题

.某溶液中可能含有SO₄^2-、CO₃^2-、Cl^-。为了检验其中是否有SO₄^2-，除BaCl₂溶液外，还需要的溶液是 [ ]

A．H₂SO₄

B．HCl

C．NaOH

D．NaNO₃