2041.Disengage the clutch before you start the engine.

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. Use a solution of foam and water to clean.

B. Clean with bleach and water.

C. Clean with a solution of soap and water.

A. The temperature decreases - 0.00198°C per foot from sea level to the altitude at which the temperature is -56.5°C and zero above that altitude.

B. The temperature gradient from sea level to the altitude at which the temperature is -56.5°C is - 0.00198°C per foot and zero above that altitude.

C. The temperature drops 0.00198°C per foot from sea level to the altitude at which the temperature is -56.5°C and to zero above that altitude.

A. 文件必须经常修订。

B. 文件必须易于修订。

C. 文件必须容易阅读和看见。

A. 当该面积足够凉爽时,喷涂表面。

B. 当该区域足够凉时,抛光表面。

C. 当该区域足够凉时,喷涂表面。

A. 注:在随后的测试中,当来自交输进口的燃油流量超过 5 毫升/分钟时,你将获得开启压力。

B. 注:在随后的测试中,当来自交输进口的燃油流量超过 5 毫升/分钟时,你将获得刮痕压力。

C. 注:在随后的测试中,当来自横穿进口的燃油流量超过 5 毫升/分钟时,你将获得刮痕压力。

D. C.注:在随后的测试中,当来自横穿进口的燃油流量超过 5 毫升/分钟时,你将获得刮痕压力。

A. A Weight and Moment Limit diagram shall be used to describe the c.g.limits.

B. The maximum weight moment envelope diagram should be used to describe the c.g.limit of the aircraft.

C. A Weight and Moment Limit diagram shall be used to describe the maximum c.g.limit.

A. 如果因出现腐蚀而不得不拆除螺栓,则涂抹润滑油。

B. 如果因腐蚀而不能拆卸螺栓,则涂抹渗透润滑油。

C. 出现腐蚀时不可以拆卸螺栓,需要先涂抹防蚀剂。

A. Sudden changes in temperature can adjust the internal logic.

B. The internal logic adjusts to sudden changes in temperature.

C. The internal logic can be adjusted by sudden changes in temperature.

A. 为加快固化过程,对部件进行热处理。

B. 为加快风化过程,给化合物加热。

C. 为加快固化过程,给化合物加热。