The thickness of the strap should be between 1 and 1.2 times the thickness of the initial stringer pad.

A. When you try to change a word, make sure that the substitute you choose doesn＇t replace the meaning of the sentence.

B. Make sure that the chosen replacement word will not vary the implication of the sentence if you replace a word.

C. When you replace a word, always make sure that the alternative you select does not change the meaning of the sentence.

A. The glideslope path is at a constant angle to the threshold of the runway.

B. The glideslope path is at a variable angle to the first end of the runway.

C. The vertical course path is at a fixed angle to the threshold of the runway.

A. Incorrect adjustment of the stops will lead to accurate test results.

B. In precision, test results cannot occur unless the stops are adjusted properly.

C. If the stops are not adjusted Incorrectly, the test results will not be precise.

A. 小心地把阀门组装在其位置上，并安装封圈和螺栓。

B. 小心地把阀门组件放置到位，并安装垫片和螺栓。

C. 小心地把组件阀门放置到位，并安装垫片和螺帽。

A. They comprise the three parts as follows:tail assembly,the structures at the rear of the airplane ,structures forming part of and attached to the wing.

B. They include three parts,one of them is tail assembly,one of them is the structures part at the rear of the airplane,one of them is structures part that forming part of and attached to the wing.

C. They include two parts,one of them is tail assembly at the rear of the airplane that serve to control and maneuver the aircraft,another of them is structures part that forming part of and attached to the wing.

A. The aft lanyard attached to the access door to the right APU compartment is broken.

B. The after end of lanyard attached to the access door to the right APU compartment is fractured.

C. The lanyard attached to the after end of the right access door to the APU compartment is frayed.

A. 仔细测量滑油的容积。

B. 仔细测量滑油的流速。

C. 仔细测量滑油的密度。

A. A small child should sit in an unlimited seat.

B. A small child needs to sit in a seat with safety device.

C. A small child could sit in an adult seat.

A. 发动机防冰系统能消除和防止因引气产生的发动机部件结冰（不包括整流罩），包含活门、管路、调节器等零件。

B. 发动机防冰系统包括活门、管路、调节器等部件，能通过引气消除和预防发动机所有部件结冰（不包括整流罩）。

C. 发动机防冰系统是用于消除和防止发动机所有部件结冰的系统部分（不包括整流罩），包括活门、管路、调节器等项目。

A. The compressor needs to be equipped with a pressure regulator, air hoses, and an appropriate filter system to ensure that clean, dry, oil-free air is delivered to the nozzle.

B. A press regulator, air ducts, and a proper filtration system form the compressor, which surely delivers clean, dry, oily air to the spray nozzle.

C. For the compressor that ensures clean, dry, oilless air is delivered to the injector, it is necessary to be equipped with a pressurization regulator, air pipes, and an adequate filter system.