题目：
桥台排水应在台后隔水层做成（）的坡，向路堤两侧排水。
A、5％
B、8％
C、109/6
D、15％
答案：
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桥台排水应在台后隔水层做成（）的坡，向路堤两侧排水。A、5％ B、8％ C、109/
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