皮皮学，免费搜题
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【单选题】
不属于BCU的是A.
模拟转换阀
B.
称重阀
C.
脉冲电磁阀
D.
中继阀
拍照语音搜题，微信中搜索"皮皮学"使用
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【单选题】流体在管道内的流动分层流和湍流两种状态,其中雷诺数 Re ()为旺盛湍流。
A.
＜ 2300
B.
＞ 10 4
C.
=4200
D.
2300 ＜ Re ＜ 10 4
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