【名词&注释】
消防水带(fire hose)、PSC检查官
[单选题]导致PSC检查官对所检查的船舶进行更详细检查的"明显理由"包括______。Ⅰ、证书明显失效的证据Ⅱ、船长或船员不熟悉涉及船舶安全和防污的船上基本操作Ⅲ、缺少最新的应变部署表、防火控制图
A. Ⅰ+Ⅱ
B. Ⅰ+Ⅱ+Ⅲ
C. Ⅱ+Ⅲ
D. Ⅰ+Ⅲ
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举一反三：
[单选题]消防水带每______检查一次。
A. 6个月
B. 4个月
C. 3个月
D. 5个月
[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
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