A、 If as many as 50% of the holes are contaminated, you should clean the display units behinds the holes.
B、 The holes on the bottom of the display unit should be cleaned once over 50% of them are clogged due to contamination.
C、 If contamination causes a blockage of more than 50 percent of the holes, then clean the holes on the rear of the display units.
答案：C
A、 If as many as 50% of the holes are contaminated, you should clean the display units behinds the holes.
B、 The holes on the bottom of the display unit should be cleaned once over 50% of them are clogged due to contamination.
C、 If contamination causes a blockage of more than 50 percent of the holes, then clean the holes on the rear of the display units.
答案：C
A. "EMERGENCY EXIT" placard at exit hatch over Left wing is illegal.
B. "EMERGENCY EXIT" placard at exit hatch over Left wing is not legible.
C. "EMERGENCY EXIT" placard at exit hatch over Left wing is missing.
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. 为了简化阅读和相互援引，插图、图形和表格应尽可能以纵向排列布局呈现。
B. 为方便阅读和相互参照，如可行，插图、图形和表格应垂直排列布局。
C. 为了精简阅读和交叉索引，插图、图标和表格如可行，应纵向排列布局。
A. 它应包含进行验证试验所需的所有信息，以将系统或组件稳定性保持在可接受水平，无需参考其他附加文件。
B. 它应包含所有重要的信息来执行功能测试，以使系统或组件性能保持在可接受水平，无需参考其他附加文件。
C. 为了使系统或组件性能保持在正常水平，而不参考其他附加文件，它应包含执行验证试验所需的所有信息。
A. A mixture of fuel and oxygen can cause an explosion.
B. A mixture of fuel and nitrogen can cause an burn.
C. A mixture of gas and oxygen should cause an explosion.
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。
A. The swivel nuts on both valves engage threads on an internal stem that loosens or draws tight the valve stem to a metal seat.
B. The rotating nuts on both valves are meshed with the threads on the inner valve stud, so that the valve stud is loosened or tightened to a metal valve base.
C. The swing nuts on both valves engage with the threads on the internal spool, allowing the spool to loosen or tighten to the metal seat.
A. 警告铃声和喇叭将开始响起，然后再次停止。
B. 警示铃声和喇叭将会停止启动，然后再次响起。
C. 先开启警告铃声和麦克风，然后再停止使用。
A. A mixture of fuel and oxygen can cause an explosion.
B. Fuel and oxygen react with each other to cause explosion.
C. A mixture of fluid and oxygen can be set on fire.
A. 在接下来的测试中，当穿越供油端口的燃油流量大于5毫升每分钟时，将得到破裂压力。
B. 在分项测试中，当穿越供油端口的燃油流量大于5毫升每分钟时，将得到开启压力。
C. 在接下来的测试中，当交输端口的燃油流量大于5毫升每分钟时，将得到开启压力。
