Do not open the housing while the electrical power is connected.

A. 滤油器内如有金属颗粒，应检查滤芯是否有磨损。

B. 滤油器内如有金属残留物，立即检查滤芯是否有磨损。

C. 滤油器内如有金属颗粒，应确认滤芯的磨损情况。

A. Energy is never created or lost, it＇s a physics law that it just changes from one kind of energy to another and in our case, motion energy turns into heat energy when we brake

B. It is a law of physics that energy is never produced or destroyed. It just changes from one type of energy into another type. In our example the kinetic energy changes into heat energy during braking.

C. Energy is never produced or lost, it＇s a physical law that it just transfers from one kind of energy to another and in our case, moving energy turns into heat energy when braking.

A. 飞行操纵面是连接在机翼上的可移动翼型结构，包括副翼、襟翼、扰流板、配平片、阻力装置和平衡装置等。

B. 飞行面是指连接在机翼上的可移动的机翼结构，包括副翼、襟翼、扰流板、标签、阻力和平衡装置等项目。

C. 飞行表面是附在机翼上的可拆卸翼型的结构，包括副翼、襟翼、扰流板、翼片、阻力和平衡装置等。

A. Turn the cap counterclockwise.

B. Turn the cap clockwise.

C. Rotate the cap clockwise.

A. Record the test results.

B. Record the check results.

C. Test the result on the record.

A. Modifications, additions and omissions, a black line should be drawn vertically at the footer outside of the page parallel to the part of the change.

B. Revisions, additions and deletions shall be identified by a vertical black line along the outside of the page opposite only that portion of the printed matter that was changed.

C. Alterations, substitutions and eliminates should be marked with a black slash outside the scope of the page to coincide with the section being changed.

A. 这种调整的正确性很重要。

B. 这种更改的正确性很重要。

C. 这种正确的调整是很重要的。

A. This tool is mandatory.

B. This tool is optional.

C. This tool is necessary.

A. 该速度指示仪此段弧线的上限是需襟翼放下时必须达到的最大速度。

B. 该速度指示仪此段弧线的上限是允许放襟翼的最大速度。

C. 该速度指示仪此段弧线的上限是襟翼收起情况下所允许的最大速度。

A. 将测量误差值控制在正或负0.2毫米内。

B. 误差为正负0.2毫米。

C. 标准公差尺寸为正负0.2米。