单选题 In a diesel engine lube oil system, which of the following parts should be lubricated first?

A、 Camshaft bearings

B、 Main bearings

C、 Piston crowns

D、 Cylinder walls

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相关试题

单选题 The USCG use a check-list so that ______.( )

A、they can inspect the ships one by one according to the list of ships

B、they can have a good understanding with the ship's officers

C、they will not miss any item to be inspected

D、ships' personnel may have a similar copy

单选题 The word which"(underline word) refers to .( )

A、a linear motion

B、a 90° motion

C、a globe

D、a valve stem

单选题 Which is not mentioned in the Company and Government anti-prevention measures?( )

A、Good communication between Company and its ship.

B、Inspecting the line connections at the manifold.

C、Covering the overboard discharge valves tightly.

D、Closing scuppers.

单选题 Which of the following statements is not true?( )

A、The valve actuators are used to open and close the valves.

B、Electric actuators can be stopped automatically when they move to the limit position.

C、The valve discs of the globe or gate valves can only be pushed or pulled in linear motion.

D、The disc of the butterfly valve can be turned 90°.

单选题 The word "the former" (underline word)means .( )

A、an electric motor

B、an actuator

C、a globe valve

D、a gate valve

单选题 Which of the following mediums used in actuators is not mentioned?( )

A、Electricity

B、Compressed air

C、Hydraulic oil

D、Spring

单选题 There is no serious consequences of pollution caused by oil spillage if______.( )

A、the cleaning-up costs are not too large

B、a good communication between ship and shore is kept

C、everyone is aware of the consequences

D、oil pollution precautions are taken

单选题 What does the passage mainly talk about?( )

A、The consequences of oil pollution.

B、Oil pollution prevention measures.

C、The United States Coast Guard inspection.

D、A major oil spillage.