單項選擇題軸承的最高精確度等級是()

A.6
B.5
C.4
D.2


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1.單項選擇題汽輪機轉(zhuǎn)子的平衡精度一般為()

A.G16
B.G6.3
C.G2.5
D.G1

3.單項選擇題汽輪機油的自燃點為()℃

A.300~350
B.350~400
C.400~450
D.450~500

5.單項選擇題普通碳素鋼的含硫量不大于()%,含磷量不大于()%

A.0.055,0.045
B.0.045,0.04
C.0.05,0.06
D.0.045,0,05