圆柱形外管嘴的正常工作条件是
A.作用水头Ho≥9m,管嘴长度l=(1~2) d
B.作用水头Ho≤9m,管嘴长度l(1~2) d
C.作用水头Ho≥9m,管嘴长度l=(3~4) d
D.作用水头Ho≤9m,管嘴长度l=(3~4)d
正确答案是D
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