正确答案: D

Ⅰ+Ⅱ+Ⅲ

题目：造成产品出现早期故障期的原因（）。Ⅰ.设计上的缺陷；Ⅱ.制造上的缺陷；Ⅲ.使用中磨合不合适

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学习资料的答案和解析：

[单选题]现代柴油机排烟温度下降，不利于废气锅炉的余热利用，因此规定废气锅炉设计的标定工况是：废气锅炉排气进口温度t1为（）℃，出口温度t2为（）℃。

255/188

[单选题]检测轴系中心线状态发现δ总和φ总均严重超差，应采取（）的措施进行调整。

同时调整艉轴和主机的位置

[单选题]艉轴管装置的主要作用是（）。Ⅰ.支承，Ⅱ.减磨，Ⅲ.密封，Ⅳ.散热，Ⅴ.构成轴系。

Ⅰ＋Ⅲ

[单选题]测量螺旋桨螺距时采用的量具是（）。

螺距规

[单选题]The cooling of the piston is carried out by circulating （） across the underside of the crown and inside the ring belt or through specially shaped passages.

lubricating oil

[单选题]The cooling water temperature （） over a period of 8 hours, and then shut down.

should be gradually reduced

[单选题]The rim of the piston may contain cut-out portions to accommodate （） when they open.

the valves

[单选题]Valve overlap is the period during which （）.

both valves are ope

[单选题]Suppose the rated capacity of the main engine of a ship is 10,000 KW at 100 rated rpm, then when at 80 rpm its capacity should be （）.

5120 KW