（） are generally formed in the frame of the both in-line a

【名词&注释】

可靠性(reliability)、铝合金(aluminum alloy)、主要因素(main factors)、巴氏合金(babbitt alloy)、铜铅合金(copper-lead alloy)

[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

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学习资料：

[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

[单选题]轴系应用合理校中原理校中时，普遍采用（）定位，然后用（）验证。

A. 测偏中值法/顶举法
B. 顶举法/测偏中值法
C. 顶举法/顶举法
D. 测偏中值法/测偏中值法

[单选题]油润滑艉轴承的轴承材料一般选用（）。

A. 巴氏合金
B. 铜铅合金^{(copper-lead alloy)}
C. 铜锡合金
D. 高锡铝合金

[单选题]中间轴承对轴系可靠性影响的主要因素是中间轴承的都不对（）。Ⅰ.位置；Ⅱ.数量；Ⅲ.间距

A. Ⅰ+Ⅱ
B. Ⅰ+Ⅲ
C. Ⅱ+Ⅲ
D. Ⅰ+Ⅱ+Ⅲ

[单选题]The fuel injector injects a fine spray of fuel into the hot air and combustion （）, producing much high pressure in the gases.

A. has begun
B. takes place
C. occurs
D. happe

[单选题]Connecting rods in a diesel engine are used to connect the （）.

A. engine to the bed
B. rocker arm to the camshaft
C. crankshaft to the gear train
D. piston to the crankshaft

[单选题]Which of the combustion parameters listed is used in a diesel engine, but NOT related to the injection system?（）

A. Atomization
B. Metering
C. Effective stroke
D. Penetratio

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