A、 Removal of the cover is necessary.
B、 It is necessary to install the cover.
C、 It is a must to remove the cover.
答案：A
A、 Removal of the cover is necessary.
B、 It is necessary to install the cover.
C、 It is a must to remove the cover.
答案：A
A. In procedural sentences, you can use a maximum of 20 words before the comma.
B. In procedural sentences, you can use a maximum of 20 words before the colon.
C. In procedural sentences, you can use at least 20 words before the full stop.
A. This system does not supervise the normal channels of communication for this item.
B. This system does not remove the normal channels of communication for this item.
C. This system does not supersede the normal channels of communication for this item.
A. 臭氧转换器通过臭氧对膜材料进行氧化，从而防止空气分离模块受损。
B. 臭氧转换器防止臭氧对膜材料进行氧化，从而避免空气分离模块受损。
C. 臭氧转换器防止空气分离模块受损，以使得臭氧对膜材料进行氧化。
A. For line maintenance carried out at a line station of an organization which is located outside the Community territory, the certifying staff may be qualified in accordance with the national aviation regulations of the State in which the line station is ba
B. For line maintenance organization located outside the Community territory, the certified staff may be qualified in accordance with the national aviation regulations of the State in which the line station is based.
C. For maintenance organization whose line station is located outside the Community territory, the releasing staff may be audited in accordance with the aviation regulations of the its State.
A. 由于尺寸、设计或器材的变化，需要对绘图进行修改。当绘图上有这样的修改时，要注意对字母和数字进行的修改，并在修改栏的符号上列出这些修改。
B. 由于尺寸、设计或材料的变化，需要对图纸进行修改。当图纸上有这样的修改时，要注意用字母或编号标出这些修改，并在修改栏里对照符号列出这些修改。
C. 由于尺寸、设计或材料的变化，需要对图纸进行修改。当图纸上有这样的修改时，要注意对字母和数字进行的修改，并在修改栏的符号上列出这些修改。
A. 将飞机速度除以侧风分量来得到修正。
B. 用侧风分量除以飞机速度，得到修正值。
C. 将侧风部件和飞机分开，来得到正确的速度。
A. IAS shall be monitored continuously until the end of the test.
B. Monitor the speed indication as long as the test continues.
C. Monitor the speed indication continuously until the end of the test.
A. Passenger reading lights at cabin rows 12B, 14C, and 17A does not come on.
B. Passenger reading lights at cabin rows 12B, 14C, and 17A do not illuminate.
C. Passenger reading lights at cabin rows 12B, 14C, and 17A is not on.
A. Station shows the height along the fuselage between the reference datum and the position in inches.
B. Station is the distance of a point of fuselage to the location of reference datum along the centerline in centimeters.
C. Station means a position along the fuselage measured in inches from the reference datum.
A. In technical texts, you can use abstractions to make sentiments shorter and easier to read.
B. In technical texts, you can use abbreviations to make sentences shorter and easier to read.
C. In technical texts, you can use abstractions to make sentences shorter and easier to understand.
