單項(xiàng)選擇題單閥手把置于運(yùn)轉(zhuǎn)位時(shí)制動(dòng)缸壓力由300kPa降至35kPa的時(shí)間為()

A.小于3s
B.小于4s
C.小于5s
D.小于6s


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