【名词&注释】
环氧树脂(epoxy resin)、水位计(water level gauge)、聚氯乙烯塑料(polyvinyl chloride plastics)、主要因素(main factors)、齿轮泵(gear pump)、非金属材料(nonmetallic material)、大幅度(greatly)、抗腐蚀剂(anticausticon)、抗氧化添加剂(antioxidant additive)、在海上
[单选题]齿轮泵工作时所受径向力大小与( )无关。
A. 齿宽
B. 齿顶圆直径
C. 吸、排压力差
D. 转速
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举一反三：
[单选题]第二组：Magnetic pickup (MPU) sensors are devices which can be used in conjunction with electronic control modules for monitoring of parameters such as speed, direction of rotation and a variety of alarm conditions. MPU sensors are available in various sizes and types. Following are some guidelines for their selection on industrial engines. MPUs are located near a flywheel, camshaft or other type of gear with rotation relative to engine speed. The passing of the gear teeth through the MPU tip (pole) generates a voltage and frequency. This frequency is converted to a speed reference by a control module. It should be noted here that most MPUs will develop similar signals. However, the magnitude and strength of the signal is dependent on the size of the sensor in relation to the gear teeth, the clearance between the pole piece and the gear teeth, and various other factors. As a general rule of thumb, the following standards should be met:①Dimension of tooth top surface should be equal to or more than the pole piece diameter.
A. ②Tooth height should be equal to, or more than the space between teeth.
B. ③The space between teeth should be approximately three times the pole piece diameter.
C. ④Air gap (clearance) between tooth and pole piece should be between 0.015" to 0.030". MPUs
D. normally have 3/8", 5/8" threads and 2", 3" and 4" lengths. Determining which size is appropriate
E. depends on the space available for installation, the availability of pre-drilled holes and consideration to
F. those rules mentioned above. In most cases, these will be the only factors affecting the selcetion of a
G. MPU.
H. MPUs can be used to ____.①sense speed ②supply alarm ③sense direction of rotation.
I. ①②
J. ②③
K. ①③
L. ①②③
[单选题]为了提高柴油机气缸油在高温下保持油膜的能力，在气缸油中加入了( )。
A. 极压添加剂
B. 油性添加剂
C. 抗腐蚀剂(anticausticon)
D. 抗氧化添加剂(antioxidant additive)
[单选题]下列说法正确的是：I追越仅存在于狭水道或航道中；II构成追越的条件之一是两船构成碰撞危险；III根据海员通常做法，在狭水道或航道中一般从前船的左舷追越IV保持与被追越船有足够的横跨是追越船的责任和义务。
A. I～IV
B. II～IV
C. II，IV
D. III，IV
[单选题]当载荷不变时，影响吊杆的轴向压力的主要因素是( )。
A. 支悬高度的大小
B. 吊杆的有效长度
C. 吊杆有效长度与支悬高度的比值
D. 吊杆有效长度与支悬高度的差值
[单选题]有关避免碰撞的行动，下列说法正确的是：I、任何避免碰撞的任何行动均应是积极的、及时的、大幅度(greatly)的；II、任何避免碰撞的任何行动，均应是积极的、及时的、大幅度(greatly)的；III、根据驾驶和航行规则所采取的任何避免碰撞的行动，如当时环境许可，均应是积极的、及时的、大幅度(greatly)的
A. I、II、III
B. II、III
C. III
D. II
[单选题]船舶低压管路可采用非金属材料中的( )来替代金属材料。
A. ABS塑牡
B. 硬质聚氯乙烯塑料
C. 环氧树脂
D. ABS塑牡或硬质聚氯乙烯塑料
[单选题]压力水柜水位计正常，若发现水位计充满水，应( )。
A. 放水后起动水泵供水
B. 放水并补气
C. 直接补气
D. 放气
[单选题]在海上，当你看到来船的号灯仅为红、红垂直两盏灯和红绿舷灯，则来船为＿＿＿＿。
A. 从事捕鱼的船舶
B. 失去控制的船舶在航对水移动
C. 失去控制的船舶不对水移动
D. 失去控制的船舶在航
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