A、 instruments are delicate precision devices and calibrited used to measuring electrical .All instruments should be periodically checked for accuracy by the manufacturer or by some shop approved by manufacturer.
B、 instruments are delicate precision devices and calibrited used to measuring electrical .All instruments should be continuously checked for correct by the manufacturer or by some shop autherized by manufacturer.
C、 Electrical measuring instruments are delicate precision devices and calibrited.All instruments should be periodically checked for accuracy by the manufacturer or by some shop approved by manufacturer.
答案：C
A、 instruments are delicate precision devices and calibrited used to measuring electrical .All instruments should be periodically checked for accuracy by the manufacturer or by some shop approved by manufacturer.
B、 instruments are delicate precision devices and calibrited used to measuring electrical .All instruments should be continuously checked for correct by the manufacturer or by some shop autherized by manufacturer.
C、 Electrical measuring instruments are delicate precision devices and calibrited.All instruments should be periodically checked for accuracy by the manufacturer or by some shop approved by manufacturer.
答案：C
A. Ensure that the parts bond correctly by applying pressure on the base of the patch.
B. Apply weight to the patch surface to ensure a correct bond between the parts.
C. Do not put pressure on the surface of the patch, as it is unnecessary for proper bonding.
A. 在工作区入口处设置安全屏障。
B. 在工作区域放置安全电源。
C. 放置安全屏障在入口通道的位置。
A. 对退漆后的表面的修理必须是面积小于100平方英寸（645平方厘米），如果超过这一面积，则必须得到额外批准。
B. 对于分层的表面修理，面积不得超过100平方英寸（645平方厘米）。如果超出，你必须做部分更换。
C. 装饰面的修补面积必须小于100平方英寸（645平方厘米），如果超过这一面积，则必须更换该部件。
A. The condition of the radome is very important for its performance.
B. The condition of the antenna influences its properties greatly.
C. The condition of the radar has an important effect on its characteristics.
A. When this material comes into contact with hot surfaces, it emits hazardous fumes.
B. Contact between hot surfaces and this material results in the release of harmful heat.
C. Dangerous fumes are consumed by this material upon contact with hot surfaces.
A. "EMERGENCY EXIT" placard at exit hatch over Left wing is illegal.
B. "EMERGENCY EXIT" placard at exit hatch over Left wing is not legible.
C. "EMERGENCY EXIT" placard at exit hatch over Left wing is missing.
A. This tool is mandatory.
B. This tool is optional.
C. This tool is necessary.
A. 供给系统有这些用处。
B. 分散系统有这些功能。
C. 分配系统有这些功能。
A. 描述飞机发动机时，应说明新发动机和拆装后发动机的正确维修操作方法。
B. 描述飞机发动机时，应说明新发动机和损坏后发动机的正确操作和保养。
C. 描述飞机发动机时，应说明全新发动机和磨合期后发动机的正确操作和保养。
A. Get a sample of hydraulic fluid.
B. Scavenge the hydraulic fluid.
C. Service the hydraulic reservoirs.
