【名词&注释】
压缩比(compression ratio)、持续性(persistence)、燃烧室(combustion chamber)、圆锥体(cone)、落水者(fall in water person)、传动带(transmission belt)、机动船(motor vessel)、受限制的(restricted)
[单选题]带传动中，紧边是指传动带(transmission belt)由( )送出，而向( )缠绕的一边。
A. 主动轮/从动轮
B. 从动轮/主动轮
C. 张紧轮/主动轮
D. 张紧轮/从动轮
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举一反三：
[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
[单选题]落水者体温下降的速度取决于几个条件：
A. 2个
B. 3个
C. 4个
[单选题]甲船是机动船(motor vessel)在航，从左舷60度驶来一艘显示一尖端对接的两个圆锥体号型的乙船，存在碰撞危险，按规定________。
A. 乙右转
B. 乙左转
C. 甲让乙
D. 各自右转
[单选题]If some of the cylinders are not firing, the ones affected may be determined by watching
A. the exhaust temperature
B. the exhaust pressure
C. the governor
D. the fuel flow meter
[单选题]下列关于压缩比的说法中哪一个是正确的()
A. 压缩容积与气缸总容积之比
B. 气缸工作容积与燃烧室容积之比
C. 气缸总容积与燃烧室容积之比
D. 气缸总容积与气缸工作容积之比
[单选题]《中华人民共和国非机动船(motor vessel)安全航行暂行规则》中规定，非机动船(motor vessel)在航时应给________让路。
A. 从事捕鱼的船舶
B. 所有操纵能力受限制的(restricted)船舶
C. 所有操纵失灵的船舶
D. 除机动船(motor vessel)外的被追越船
[单选题]动脉出血特征为______。
A. 缓慢、持续性，颜色暗红
B. 喷射状、随心搏动而增强，色鲜红、量多
C. 涌出状、色鲜红、量不多
D. 以上都不对
[单选题]船舶由半淡水水域驶入淡水水域时，船舶所受浮力( )。
A. 不变
B. 变化不定
C. 减少
D. 增加
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