[单选题] An aluminum piston has lower inertia and higher coefficient of _____ compared to that of cast iron．

1、[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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2、[单选题]Which of the followings is not an indication of a bad maintenance? _____________.

• A、a pipe with welded connections
• B、 a pipe with several clips
• C、 a cement box
• D、 a leaking valve

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3、[单选题]The responsibilities of the engineer officer in charge of the watch do not include________ .

• A、to ensure the main propulsion plant are kept under constant surveillance
• B、 to ensure the auxiliary systems are kept under constant surveillance
• C、 to inspect the steering gear spaces at suitable intervals
• D、 to inspect and overhaul the equipments in his charge

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4、[单选题]Which kind of vessel is not required to comply with the ISM code until 2002?

• A、Passenger ships and high-speed crafts of 500 gross tons or more
• B、 Oil tankers and Chemical tankers and Gas carriers
• C、 Bulk freight vessels
• D、 General cargo vessels

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5、[单选题]The MARPOL Convention is the main international convention .

• A、about marine pollution prevention
• B、 covering marine protection of life
• C、 about marine
• D、 about ship and port security

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