【名词&注释】
活塞环(piston ring)、机动船(motor vessel)、船舶保安员(ship security officer)、公司保安员(company security officer)
[单选题]《国际船舶保安和港口设施保安规则》提到有关船舶保安简称，正确的是______。Ⅰ、船舶保安计划：SSPⅡ、船舶保安体系：SSSⅢ、船舶保安员：CSOⅣ、公司保安员(company security officer)：SSOⅤ、国际船舶保安证书：ISSC
A. Ⅰ＋Ⅱ＋Ⅳ
B. Ⅰ＋Ⅱ＋Ⅴ
C. Ⅰ～Ⅳ
D. Ⅰ～Ⅴ
查看答案&解析
举一反三：
[单选题]A机动船从B机动船右正横后22.5度方向上接近B船，并致有构成碰撞危险，下列说法何者正确________。
A. 如A船对本船是否在追越前船有任何怀疑，应假定在追越
B. 如B船对A船是否在追越本船有怀疑，应将本船作为让路船
C. A和B均正确
D. A和B均不正确
[单选题]_____ shows 1.2 meter and the specific gravity of the oil is 0.96According to the measuring scale, that makes 150 tons.
A. The piston rod
B. The push rod
C. The sounding rod
D. The connecting rod
[单选题]活塞环在气缸中起着密封、散热和______的作用。
A. 导向
B. 冷却
C. 布油
D. 传递力
[单选题]搬动胸、腰椎外伤病员，如果只有帆布担架，病人的姿式只能( )。
A. 仰卧
B. 俯卧
C. 侧卧
D. 坐位
[单选题]在较温暖的海水中求生者应：
A. 少穿衣服
B. 不穿衣服
C. 多穿衣服
D. 都可以
[单选题]第一组： The Wartsila 50DF operates on the lean-bum principle: the mixture of air and gas in the cylinder has more air than is needed for complete combustion. Lean combustion reduces peak temperatures and therefore NOx emissions. Efficiency is increased and higher output is reached while avoiding knocking. Combustion of the lean air-fuel mixture is initiated by injecting a small amount of LFO (pilot fuel) into the cylinder. The pilot fuel is ignited in a conventional diesel process, providing a high-energy ignition source for the main engine. To obtain the best efficiency and lowest emissions, every cylinder is individually controlled to ensure operation at the correct air-fuel ratio and with the correct amount and timing of pilot fuel rejection. Wartsila has developed a special electronic control system to cope with the demanding task of controlling the combustion in each cylinder, and to ensure optimal performance in terms of efficiency and emissions under all conditions by keeping each cylinder within the operating window. Stable and well-controlled combustion also contributes to less mechanical and thermal load on the engine components. Current stringent emission regulations demand the reduction of NOx emissions. In an internal combustion engine this means controlling peak temperature and residence time, which are the main parameters governing NOx formations. In the Wartsila 50DF engine, the air-fuel ratio is very high (typically 2.2). Since the same specific heat quantity released by combustion is used to heat up a larger mass of air, the maximum temperature and consequently NOx formation are lower. The mixture is uniform. throughout the cylinder since the fuel and air are premixed before introduction into the cylinders, which helps to avoid local NOx formation points within the cylinder. Benefiting from this unique feature, NOx emissions from the Wartsila 50DF are extremely and comply with the most stringent existing legislation.What is the combustion feature of the Wartsila 50DF?
A. Lean air in the cylinder
B. Excessive fuel in the cylinder
C. Excessive air in the cylinder
D. Spark ignition
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