低速柴油机的最低稳定转速不高于标定转速的（）%。

【名词&注释】

柴油机(diesel engine)、算术平均值(arithmetic mean)

[单选题]低速柴油机的最低稳定转速不高于标定转速的（）%。

A. 15
B. 30
C. 40
D. 45

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学习资料：

[单选题]桨叶平均螺距是桨叶（）螺距的算术平均值。

A. 各半径截面的截面
B. 各半径截面实测局部
C. 各半径截面实测
D. 各半径截面局部

[单选题]（） are generally formed in the frame of the both in-line and Vee engines to give maintenance access to the crankshaft main and connecting rod large end bearing.

A. Doors
B. Aspirate gauzer
C. Coupling
D. Blind

[单选题]For Vee-form engines, （） is shaped to given two slopping surface on which （） are placed at the correct relative angle to each other.

A. the bottom of the column；the cylinder blocks
B. the top of the column；the cylinder heads
C. the top of the column；the cylinder blocks
D. the bottom of the column；the cylinder head

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