The scratch does not penetrate the protective layer.

A. 外圆周长必须与内圆周长相匹配。

B. 外侧半径必须与内侧半径等比例。

C. 外径必须与内径同心。

A. Check the bypass valves.

B. Close the isolating valves.

C. Inspect the check valves.

A. If the wheel temperature reaches as high as 177 deg., the core of safety plug shears off and the tire slips.

B. If the wheel temperature increases to more than 177 deg., the core of the fusible plug melts and the tire deflates.

C. The core of the filter element melts once the wheel temperature is above 177 deg., causing the tire to deflate.

A. 风干过滤器。

B. 在大气中干燥排油口。

C. 在空中排干加油口。

A. Clear the pipes in order to remove corrosion.

B. Wash the pipes so as to remove dust.

C. Flush the pipes to remove contamination.

A. To help the tracing circuit, we need to build trunk wire recognition code.

B. Separate wire identification codes are built to assist in tracing circuits.

C. Unitive wire identification codes provide assistant in tracing circuitry.

A. 加载弹簧的张力。

B. 释放弹簧的张力。

C. 调整弹簧的伸缩。

A. Refer to the general information in addition to engine operation limits, guidelines and special procedures.

B. For general information, refer to engine operation limits, guidelines and special procedures.

C. Refer to engine operation limits, guidelines and special procedures besides general information.

A. 对于利用空气作为防冰介质的涡轮类动力装置，发动机防冰功能包含在空气系统中。

B. 因为涡轮类型动力组合使用气体作为防止积冰的渠道，发动机防积冰设备被储存在空气系统下。

C. 因为涡轮动力装置将空气用来防止积冰，发动机防冰包含在通风系统中。

A. Do not give vague, general information.

B. Do not provide clear, general information.

C. Do not list complex, valid information.