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單項(xiàng)選擇題

液力傳動(dòng)油的閃點(diǎn)不應(yīng)低于（）℃。

A.190
B.180
C.170
D.160

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單項(xiàng)選擇題

油缸的有效面積為500000mm²，工作壓力為25Pa，則油缸的推力為（）

A.12.5*10⁵N
B.1.25*10⁵N
C.12.5N

單項(xiàng)選擇題

磨床砂輪架砂輪主軸軸承，系采用自動(dòng)調(diào)位動(dòng)壓軸承，裝配時(shí)接觸點(diǎn)數(shù)要求為16～20點(diǎn)/25mm；軸承與軸頸間隙調(diào)至（）mm。

A.0.005～0.01
B.0.01～0.015
C.0.015～0.02
D.0.02～0.025

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