Pistons may be made in （） in order to keep the weight down for balancing purposes at high speed...

第1题

[单选题] Pistons of marine medium speed diesel engines may be made of （） in order to keep the weight down for balancing purpose at high speed.

A、lead B、forged steel C、alloy steel D、aluminum alloy

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第2题

[单选题] A flashing red light displayed at a single lock means that the lock（）.

A、is ready to use but vessels must stand clear B、is ready to use and vessels may approach C、cannot be made ready immediately and vessels shall stand clear D、cannot be made ready immediately but vessels may approach

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第3题

[单选题] Diesel oil may be used to cool （） of a diesel engine.

A、cylinders B、exhaust valves C、pistons D、fuel valves

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第4题

[单选题] The engine may lose power or slow down during running, when this occurs, the first cause possible may be hot bearings and （） of the pistons in the cylinders.

A、crack B、knocking C、leaking D、seizure

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第5题

[单选题] Inquiries（）the condition of the patients may be made personally or by telephone.

A、revealing B、concerning C、affecting D、following

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第6题

[单选题] It may be that，under the contract，freight was made（）to a third person.

A、capable B、payable C、reasonable D、probable

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第7题

[单选题] Smaller engines can be made more rigid than large ones and may not have （）.

A、connecting rods B、crankshaft C、crankcase D、through bolts

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第8题

[单选题] An icebreaker may use the code letter “K” to remind ships of their obligation to listen continuously on their radio. This signal may be made by any of the following EXCEPT（）.

A、sound signal B、light signal C、visual signal D、radiotelephone

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第9题

[单选题] Smaller engines can be made more rigid than large ones and may not have （）.

A、through bolts B、dividing walls C、sloping surfaces D、relative angles

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Pistons may be made in （） in order to keep the weight down for balancing purposes at high speed.

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