【名词&注释】
能见度(visibility)、凸轮轴(camshaft)、驾驶台(driving platform)、大型低速二冲程柴油机、适用于(suitable for)
[单选题]大型低速二冲程柴油机的凸轮轴一般都采用( )。
A. 凸轮安装在分段的轴上
B. 凸轮和轴整体制造
C. 凸轮安装在轴上都采用键连接
D. 凸轮安装在整体的轴上
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举一反三：
[单选题]第一组Older loop scavenged engines may have a single injector mounted centrally in the cylinder head. Because the exhaust valve is in the center of the cylinder head on modern uniflow scavenged engines the fuel valves (2 or 3) are arranged around the periphery of the head. The pressure at which the injector operates can be adjusted by adjusting the loading on the spring. The pressures at which the injectors operate vary depending on the engine, but can be as high as 540 bar. Some injectors have internal cooling passages in them extending into the nozzle through which cooling water is circulated. This is to prevent overheating and burning of the nozzle tip. Injectors on modern engines do not have internal cooling passages. They are cooled by a combination of the intensive bore cooling in the cylinder head being close to the valve pockets and by the fuel which is re-circulated through the injector when the follower is on the base of the cam or when the engine is stopped. As well as cooling the injector, re-circulating the fuel when the engine is stopped keeps the fuel at the correct viscosity for injection by preventing it from cooling down. Fuel injectors must be kept in good condition to maintain optimum efficiency, and to prevent conditions arising which could lead to damage within the cylinder. Injectors should be changed in line with manufacturers&39; recommendations, overhauled and tested. Springs can weaken with repeated operation leading to the injector opening at a lower pressure than designed. The needle valve and seat can wear which together with worn nozzle holes will lead to incorrect atomization and dribbling.
A. Modern uniflow scavenged engines have______.
B. a single injector mounted in the center of the cylinder head
C. several injectors mounted around the external boundary of the cylinder head
D. a single injector mounted at the external boundary of the cylinder head
E. several injectors mounted in the center of the cylinder head
[单选题]晕船的处理方法:
A. 安静平卧
B. 保暖
C. 口吸晕海宁或镇定剂
D. 以上都是
[单选题]直航船的行动条款适用于(suitable for)：I、帆船条款和船舶间责任条款中规定的直航船；II、追越条款规定的直航船；III、交叉相遇局面条款规定的直航船；IV、任何不负有让路义务的船舶
A. I
B. I、II
C. I、II、III
D. I、II、III、IV
[单选题]现场指挥人员应向驾驶台报告的信息包括：1、火灾的位置、类别、范围2、火场中是否有人受困3、火场周围是否发现爆炸、毒害性物质4、火场的能见度5、控制火场通风的效果。
A. 1、2、3、4、5
B. 1、2、3、5
C. 2、3、4、5
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