题目内容：
A.50%
B.40%
C.20%
D.10%
参考答案：
答案解析：
选择题：A.50% B.40% C.20% D.10%
- 题目分类：土木工程师（水利水电）
- 题目类型：选择题
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A.50%
B.40%
C.20%
D.10%
A.50%
B.40%
C.20%
D.10%
A.40 B.14.14 C.31.62 D.20
A.40
B.14.14
C.31.62
D.20
A.1I B.0.5 C. D.2
A.1I
B.0.5
C.
D.2
A.π/6 B.π/4 C.π/3 D.π/2
A.π/6
B.π/4
C.π/3
D.π/2
A.1 B.2 C.3 D.4
A.1
B.2
C.3
D.4
A.3 B.7 C.8 D.9
A.3
B.7
C.8
D.9