轮机英语2016一月总结.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牋燘.overcooling problems?up C interrupted problems???D.overheating problems 2. A semiconductor is a 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 to poor hydraulic system response, and inadequate????lubrication, is the result of ___ .??? A. pump bearings in poor 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-decomposed waste in a collection tank C. chemically adjusting the sewage PH to 7.0 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 of a?____. 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。substandard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 humidifiers valve of air-conditioner should be ___ when the cir-cumstance temperature is raised to 5 ~ 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