Limits on any Airplane systems or equipment shall be provided. For example, limits may be necessary in connection with electrothermal elements used in ice protection systems, or in battery temperatures.

A. 门是由基础复合材料增强塑料制成的。

B. 门是由碳纤维复合塑料制成的。

C. 门是由碳纤维增强塑料制成的。

A. 裸露的金属表面通常适合电搭接。

B. 纯金属表面通常适用于电气连接。

C. 金属搭接面通常具有良好的电气连接效果。

A. The air conditioning cooling system supplies cooled air to the cabin. Includes items such as the cooling unit, indicating systems related to the cooler operation, etc.

B. The air conditioning cooling system supplies cold air to the passenger cabin. Includes items such as the cooling unit, indicating systems related to the cooler operation, etc.

C. The air conditioning cooling system supplies cooled air to the passenger cabin. Includes items such as the cooling pack, indicating systems related to the cooler operation, etc.

A. The bolt will be at the 2 o’clock position when you look at the pump from the rear.

B. The rivet is installed on the 2 o＇clock position of the pump when looking from rear to front.

C. Look at the bolt installed on the pump from rear to front at the 2 o＇clock position.

A. The revision dates need to be displayed at each revision location.

B. The revision date needs to be displayed in an obvious place.

C. The revision date should be displayed on every revision page.

A. 前轮转弯方向舵脚蹬转弯机构能混合来自于方向舵脚蹬和转弯手轮的转弯输入，并提供定中力。

B. 前轮转弯方向舵脚蹬转弯机构能混合来自于方向舵脚蹬的转弯输入进行转弯并提供定中力。

C. 前轮转弯方向舵脚蹬转弯机制能混合来自于方向舵脚蹬和转弯手轮的转弯力度，并提供折中力。

A. 涂抹两层保护性化合物，以防止液压油损坏密封胶。

B. 运用两层保护性化合物，以保护液压油对密封胶的损害。

C. 运用两层保护性成分，以防止密封胶对液压油造成损害。

A. Each surge tank has a vent scoop and pressure relief valve on its access door.

B. The vent scoop and pressure relief valve each has an access door in the surge tank.

C. The surge tank has a vent scoop and pressure relief valve on each access door.

A. The Boeing 747 symbolizes the beginning of a new ear in air transport.

B. The Boeing 747 is the first type of airplane in air transport.

C. Modern air transport started from the Boeing 747.

A. 确保自锁螺母靠近弹簧。

B. 确保锁定螺母接触弹簧。

C. 确保弹簧顶紧锁螺母。