正确答案: C

粉碎性

题目：属于不稳定性骨折的有()

解析：C

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举一反三的答案和解析：

[单选题]ISM规则中的主管机关是指______，在我国是______。

船旗国政府、国家海事局

[单选题]SMS文件及相关的层次自上而下大致是______。

安全管理手册、程序文件、操作方案/须知/相关文件

[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.

several injectors mounted around the external boundary of the cylinder head

[单选题]在化学品船上通常采取()措施以防止货品之间的反应危害。

独立货物系统管系

[单选题]驾驶台接到火灾报警后，应首先：

向全船发出消防警报。

[单选题]采用多支承点适合于( )。

不平衡舵

[单选题]直航船应包括：I、帆船条款中规定的直航船；II、追越条款中的被追越船；III、船舶之间的责任条款中规定的直航船；IV、互见中不应初妨碍的船舶

I、II、III

[单选题]下列说法中正确的是( )。

行动声号表示本船正在进行的操纵行动