[单选题] ____ are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.

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 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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3、[单选题]In deciding to detain a ship or not, the PSCO would better not_______ .

• A、make his decision independently
• B、 request the owner’ s representative to provide proposals
• C、 cooperate with the flag State Administration’ s representatives
• D、 consult the organization responsible for issuing the relevant certificates

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4、[单选题]Which of the following about ISM Code is not right? .

• A、It aims to ensure safety at sea
• B、 It aims to avoid damage to the environment
• C、 It aims to prevent human injury or loss of life
• D、 It aims to provide a method to run a company

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5、[单选题]Which of the following statements describes one of the functions of the ballast system?

• A、To permit flooding of any fuel oil storage tank on any class of ship
• B、 To use it as a secondary service system
• C、 To store reserve feed or potable water for extended cruises
• D、 To stabilize the ship by flooding certain designed tanks with seawater

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