轮机英语2016一月.doc

1. In the cooling system, a general build-up of deposits resulting a loss of thermal efficiency and leads in turn to___________ A. broken problems problems C interrupted problems problems semiconductor isa material with a____. A. conductivity higher than a normal conductor B. conductivity higher than a normal insulator C. high conductivity at low temperatures D. low conductivity at high temperatures 注: semiconductor 半导体, conductivity 导电性能;半导体的导电性能介于导体和绝缘体之间;故选 B。 3. Increased internal leakage, in addition topoor hydraulic system response, and inadequate lubrication, is the result of___ . A. pump bearings inpoor condition B. excessively worn actuator-piston packing C. broken directional control valve centering springs. D. low hydraulic oil viscosity 注:液压系统反应傻、润滑不良,而且内部泄漏大,往往是由于液压油的粘度低引起,故选 D。 4. In sewage treatment, the term maceration refers to the process of___. A. breaking up solid matter into fine particles B. precipitating non-posed waste ina collection tank C. chemically adjusting the sewage PH D. eliminating bacterium coli from the sewage 注:生活污水处理中的术语“浸渍”指的是将固体物质分解成细小颗粒的过程, 故选 A。 maceration 浸渍。 5. "Insufficiency of manning or insufficiency of certification of seafarers" is an identification ofa____. A. substandard ship B. standard ship C. over-standard ship D. reference ship 注:“配员不足或船员证书不足”是船舶不达标的一个证据,故选 A。 substandar d 低于标准的。 6. When installed for bilge pumping or ballast duty, centrifugal pumps require a____ to re- move air from the suction pipe. A. air chamber B. head tank C. primer D. prime mover 注:如果离心泵用于排放舱底水或压载之用,需要自吸装置从吸入管路排除空气, 选C。 7. The opening of the humidifier's valve of air-conditioner should be___ when the cir-cumstance temperature is raised to5~80℃ in the winter. A. decreased B. increased C. fixed D. closed 注:当冬季环境温度升至 5~8 ℃时,应关闭空调加湿阀,故选 D。 8. The operator of electrical motors should keep a constant check on the loads they carry because ____. A. low loads necessitate frequent insulation. cleaning B. exceedi