[单选题] If over a period of time, the oi1 film partially disappears, so that dry areas are formed on the cylinder wall, these areas and the piston surfaces will by frictional interaction, become finely scuffed and hardened, i. egood mirror surface" will have deterioratedWhat condition of the piston rings can result in this phenomenon?

1、[单选题]The abbreviation "GM" is used to represent the _____.

• A、height of the metacenter
• B、 fighting arm
• C、 righting moment
• D、 metacentric height

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2、[单选题]The main purpose of port State control is not to___________.

• A、prevent an unsafe ship proceeding to sea
• B、 prevent a ship threatening the marine environment
• C、 fine the ships
• D、 confirm a safe sailing

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3、[单选题]According to Annex IV of comminuted and disinfected sewage using an approved system can be discharged when the ship is more than away from the nearest land.

• A、3 n mile
• B、 5 n mile
• C、 12 n mile
• D、 25 n mile

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4、[单选题]Which of the following is false? .

• A、A company should develop a SMS and implement it
• B、 A company implementing a SMS properly may obtain a DOC
• C、 Once a company obtains its DOC, each vessel of this company will obtain a SMC
• D、 DOC is valid for 60 months unless “major non-conformity” is found

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5、[单选题]At an unsheltered anchorage the chief engineer officer shall consult with the master whether or not to maintain an underway watch“An underway watch” means______.

• A、a watch which is kept with lower standard
• B、 a watch which is kept when the ship isnt sailing
• C、 a watch which is kept when the ship is sailing
• D、 a watch which is kept when the ship is in a restricted visibility area

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