A、 Corrosion inhibitor is necessary from time to time to ensure continued protection.
B、 Corrosion inhibitor is necessary frequently so that protection remains in effective.
C、 Corrosion protection is necessary but is ineffective for cost reasons.
答案：A
A、 Corrosion inhibitor is necessary from time to time to ensure continued protection.
B、 Corrosion inhibitor is necessary frequently so that protection remains in effective.
C、 Corrosion protection is necessary but is ineffective for cost reasons.
答案：A
A. Remove the smooth areas with cotton cloth if you find them.
B. If you find alligatored areas, remove them with cotton cloth.
C. If there are rough areas, remove them with emery cloth.
A. The power plant uses an air vent or propeller to produce power.
B. The power plant develops thrust either through the exhaust or through a propeller.
C. The power plant generates propulsion with the aid of the exhaust or a propeller.
A. 拆除并丢弃开口销和螺栓。
B. 拆除并报废开口销和螺帽。
C. 拆除并破坏开口销和螺钉。
A. 大量的高压燃油供油用于作动筒控制和到燃烧室的计量燃油，其余部分通过溢流活门返回给低压系统。
B. 除作动器控制和到燃烧室的计量燃油外，过量的高压燃油供油通过溢流阀返回给低压系统。
C. 超量的高压燃油供油用于作动筒控制和到燃烧室的计量燃油，之后通过减压阀返回给低压系统。
A. Dust can contaminate all areas.
B. Dirts are contamination of all filters.
C. Dust can cause contamination on all filters.
A. 小心地展开薄板。
B. 小心地合上铝片。
C. 小心地打开钢片。
A. 向前旋转手柄。
B. 向后移动水平面。
C. 向后移动手柄。
A. 增加 0.02 mm 以达到标准圆柱耦合器的正确间距。
B. 添加 0.02 mm 以使得标准万向轴正确脱开。
C. 添加 0.02 mm 以获得标准球形联轴器的正确间隙。
A. Immediately clean the area if one of the two compartments is affected by lead contamination.
B. If there is mercury pollution in the compartments, clean one of the two areas immediately.
C. If there is mercury contamination in one of the two compartments, clean the area immediately.
A. A system consists of related components used to perform a specific function.
B. A system is a combination of interrelated components arranged to perform a specific function.
C. A system is combined with relevant components that perform a specific function.
