A、 Take care to the absence of leakage during the execution of each step in the valve test.
B、 Throughout the valve test, verify that there are no obvious signs of leakage at each step.
C、 Make certain that no leakage is present as you proceed with each step of the valve test.
答案：C
A、 Take care to the absence of leakage during the execution of each step in the valve test.
B、 Throughout the valve test, verify that there are no obvious signs of leakage at each step.
C、 Make certain that no leakage is present as you proceed with each step of the valve test.
答案：C
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. If a symbol or device is established for a valve or control, it shall be used for this type of unit throughout the manual. The symbols used should be shown and identified in a legend block on the schematic diagram.
B. If a symbol or device has been set up to a valve or control, the equipment type will be referred to as this symbol or device throughout the manual. The legend block in the diagram displays or identifies symbols or device.
C. If a symbol or design is specified for a valve or control, this type of device is used throughout the section of the manual. The symbols used can be found and identified in the legend block of the schematic.
A. The cockpit voice recorder records signals from four audio inputs during the flight.
B. The cockpit voice indicator records four audio inputs in the flight.
C. There are four cockpit voice recorders recording in-flight audio input.
A. The aircraft navigation systems provide the flight which is required by the crew,and meet the the most appropriate safety requirements.
B. The aircraft navigation systems provide the crew with the data required for flight within the most provisional safety requirements.
C. The aircraft navigation systems provide the crew with the data required for flight within the most appropriate safety requirements.
A. 拧紧螺母至足够牢固，而不是用手可以去拧动得动。
B. 拧紧螺母，但要保持足够宽松度，便于用手可以取下它。
C. 要保持螺帽被拧紧，使你的手无法拧松它们。
A. 把上凸轮放到与拆下时所做标记一致的位置。
B. 上部卡箍安装的位置应该与拆卸标记保持一致。
C. 经同意后，对应拆卸时所作的标记将上部曲柄安装在位。
A. Do not open the container if you are instructed that high pressure is dangerous.
B. If it states on the container that the pressure inside is high, do not open it.
C. If the instructions give a warning about dangerous pressure, do not open the container.
A. 不要用手辅助低压压气机的运动。如果这样做，低压压气机可能会导致人身伤害并损坏设备。
B. 不要用手阻止低压压气机的运动。如果这样做，低压压气机可能会导致人身伤害并损坏设备。
C. 不要用手移动低压压气机。如果这样做，低压压气机可能会导致人身伤害并损坏设备。
A. Rub the basin with water.
B. Flush the basin with water.
C. Fill the basin with water.
A. 将适配器及其支撑设备固定在位。
B. 将适配器靠在支柱上。
C. 将适配器与支柱接合在同一位置。
