正确答案: A

the clearance of the main bearing

题目：Measure （） by means of lead wire.

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学习资料的答案和解析：

[单选题]气缸盖底面在较高的（）等的恶劣条件下工作。Ⅰ.交变的机械负荷；Ⅱ.热负荷；Ⅲ.燃气腐蚀阀、孔；Ⅳ.冲刷；Ⅴ.冲击。

Ⅰ＋Ⅱ＋Ⅲ＋Ⅳ

[单选题]当曲柄的Δ＝（＋）值时，该曲柄的两个主轴承位置较（），曲轴轴线呈（）状态。

低/“∪”

[单选题]轴系理论中心线是（）的定位安装基准。

主机

[单选题]在进行舵系固定件同轴度检验时，拉出舵系固定件中心线的钢丝线后，测量各舵承孔至钢丝线的（）距离，以确定各舵承孔的同轴度偏差。

前后、左右

[单选题]The viscosity regulator controls the （） of the fuel oil in order to provide the oil at the correct viscosity for combustion.

temperature

[单选题]In order to reverse the rotation of a two-stroke/cycle loop scavenged, direct reversing, propulsion diesel engine, the cam positions must be changed for the （）.

starting air and fuel pumps

[单选题]Auxiliary boilers are divided into several classifications, one of which is （）.

water-tube forced circulation

[单选题]White smoke exhausting from an operating diesel engine may indicate （）.

a cracked liner