[单选题]Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because________.

正确答案 ：A

The direction of pressure on the journal in four-stroke engine is continuously

[单选题]当滤器的绝对过滤精度为10微米时，表明该滤器后________。

正确答案 ：C

10微米以上污染颗粒浓度不到滤器前的1/75

[单选题]吊架降落救生筏载足全部乘员及其属具后，至少从（）米的高度处投落水中，不得有影响其性能的损坏。

正确答案 ：B

3

[单选题]零件疲劳断裂后，其断口分为( )区。Ⅰ.疲劳源;Ⅱ.贝纹;Ⅲ，裂纹扩展;Ⅳ.断裂;Ⅴ.材料。

正确答案 ：B

Ⅰ+Ⅲ+Ⅳ

[单选题]One of the reasons that causes oil flowed from sludge outlet of a self-cleaning purifier is

正确答案 ：B

make-up water supply be cut off

[单选题]第三组：Ship recycling contributes to sustainable development and is the environmentally friendly way of disposing of ships with virtually every part of the hull, machinery, equipment, fittings and even furniture being re-used. However, while the principle of ship recycling is a sound one, the reported status of working practices and environmental standards in recycling facilities often leaves much to be desired. Such growing concerns about environmental safety, health and welfare matters in the ship recycling industry have resulted in a growing belief that an international instrument to regulate the ship recycling process is urgently needed.

正确答案 ：F

Ship recycling brings many problems concerning environmental safety, health and______occupational safety

[单选题]The bridge should inform the engine room______before passing through congested or shallow waterway.

正确答案 ：C

1 hour

[单选题]油轮上向油舱或机舱内施放的泡沫为______。

正确答案 ：A

高倍泡沫

[单选题]右舷受风的帆船A看到位于其上风位置的另一帆船B驶近致有构成碰撞危险，则________。

正确答案 ：D

B和C正确

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