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【单选题】

In order to increase the wearing resistance, the cylinder liner surfaces are sometimes （）.

A、aluminum-plated

B、bronze-plated

C、zinc-plated

D、chromium-plated

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第1题
[单选题] Air chambers are usually fitted to reciprocating pumps in order to （）.

A、increase discharge pressure  B、increase suction vacuum  C、develop pulsation flow  D、keep a steady rate of flow  

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第2题
[单选题] Why would an administrator change the value of the spanning-tree priority of a switch?（）

A、in order to optimize the path that frames take from source to destination  B、to increase the priority so a designated port will become a root port  C、to increase the BID, so the switch is more likely to become root bridge  D、in order to allow VLANs to be sent from one switch to another across a single link  E、to force a given switch to become an STP server  

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第3题
[] While troubleshooting a network outage, you discover that an employee brought a switch from home into the office to connect additional equipment to the network. In order to increase his speed, he connected this switch to both network ports in his office, resulting in a bridge loop. Which of these can you implement to prevent future occurrences of this issue?（） While troubleshooting a network outage, you discover that an employee brought a switch from home into the office to connect additional equipment to the network. In order to increase his speed, he connected this switch to both network ports in his office, resulting in a bridge loop. Which of these can you implement to prevent future occurrences of this issue?（）

A、A.RSTP  B、B.root guard  C、C.BPDU guard  D、D.GLBP  

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第4题
[] In a crossing situation，a stand-on vessel which is forced to take action in order to avoid collision with a vessel on her own port side shall，if possible，avoid（）.

A、A.turning to port  B、B.turning to starboard  C、C.decreasing speed  D、D.increasing speed  

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第5题
[单选题] While troubleshooting a network outage, you discover that an employee brought a switch from home into the office to connect additional equipment to the network. In order to increase his speed, he connected this switch to both network ports in his office, resulting in a bridge loop. Which of these can you implement to prevent future occurrences of this issue?（）

A、RSTP  B、root guard  C、BPDU guard  D、GLBP  

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第6题
[单选题] In order to reduce the accumulation of static electricity while loading petroleum products，you should（）.

A、start to load at maximum pressure  B、start to load slowly  C、increase the air flow into the tank  D、use the overall method of loading only  

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第7题
[单选题] In order to log（）the system you have to type in your password.

A、in  B、on  C、in to  D、off to  

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第8题
[单选题] In order to ensure that a RACON signal is displayed on the radar，you should（）.

A、increase the brilliance of the PPI scope  B、turn off the interference controls on the radar  C、use the maximum available range setting  D、increase the radar signal output  

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第9题
[单选题] When preparing a ship for heavy weather，fuel oil day tanks should be（）.

A、pumped overboard to calm the seas  B、drained to the lower hull to reduce free surfaces  C、filled to ensure that sufficient fuel oil is available during a lengthy emergency  D、partially drained to increase free surfaces in order to reduce motions  

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