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[单选题]平衡精度的等级是按照()来划分的。
A. e
B. [e]
C. [e]•ω
D. e•ω
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学习资料:
[单选题]中间轴承有()。Ⅰ.上瓦和下瓦D.仅有下瓦;Ⅲ.上下瓦可以互换
A. 仅Ⅰ对
B. 仅Ⅱ对
C. Ⅰ+Ⅲ
D. Ⅰ或Ⅲ
[单选题]Shims of different thicknesses are inserted between the shells to enable adjustment of ().
A. the bearing clearances
B. the bearing thickness
C. the bearing strength
D. the bridge hardne
[单选题]What is an advantage of diesel over steam turbine propulsion? ()
A. Less fuel consumption per SHP
B. Diesel fuel costs less than bunker C or its equivalent
C. Less routine maintenance required
D. Less weight per SHP
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