A、 The gyroscope will become stable before less than 15 seconds.
B、 The gyroscope will become stable for at least 15 seconds.
C、 After about 15 seconds, the gyroscope will become stable.
答案：C
解析：这道题考察的是陀螺仪（gyroscope）的稳定时间。选项A说陀螺仪会在15秒之前就变得稳定，这是错误的。选项B说陀螺仪会至少稳定15秒，这也是错误的。正确答案是选项C，大约在15秒之后，陀螺仪会变得稳定。
要理解这个知识点，我们可以通过一个生动的例子来帮助记忆。想象一下你手里拿着一个陀螺，当你旋转它时，一开始它可能会摇摆不定，但随着时间的推移，它会逐渐稳定下来。就像一个孩子在玩陀螺时，需要一些时间才能让陀螺保持稳定，陀螺仪也需要一定的时间来达到稳定状态。所以，记住在大约15秒后，陀螺仪会变得稳定。
A、 The gyroscope will become stable before less than 15 seconds.
B、 The gyroscope will become stable for at least 15 seconds.
C、 After about 15 seconds, the gyroscope will become stable.
答案：C
解析：这道题考察的是陀螺仪（gyroscope）的稳定时间。选项A说陀螺仪会在15秒之前就变得稳定，这是错误的。选项B说陀螺仪会至少稳定15秒，这也是错误的。正确答案是选项C，大约在15秒之后，陀螺仪会变得稳定。
要理解这个知识点，我们可以通过一个生动的例子来帮助记忆。想象一下你手里拿着一个陀螺，当你旋转它时，一开始它可能会摇摆不定，但随着时间的推移，它会逐渐稳定下来。就像一个孩子在玩陀螺时，需要一些时间才能让陀螺保持稳定，陀螺仪也需要一定的时间来达到稳定状态。所以，记住在大约15秒后，陀螺仪会变得稳定。
A. Perform these checks without any schedule.
B. Perform these checks immediately.
C. Do these checks regularly.
A. During inspection, if the nuts and washers are removed, recheck them.
B. Take a good place for the nuts and washers removed during inspection.
C. If nuts and washers are removed during inspection, install the new ones.
解析：这道题是关于在检查过程中如果螺母和垫圈被移除应该怎么处理的问题。正确答案是C:如果在检查过程中螺母和垫圈被移除，应该安装新的螺母和垫圈。
举个生动的例子来帮助理解这个知识点：假设你正在检查一台机器，发现其中的螺母和垫圈已经磨损或者损坏了，这时候就需要将它们移除并安装新的螺母和垫圈。因为螺母和垫圈在机器中起着固定和缓冲的作用，如果它们磨损或者损坏了，就需要及时更换，以确保机器的正常运转和安全性。
A. Acquire the flight data from the recorder.
B. Eliminate the tape about the information after flight.
C. Remove a recording of flight data from the tape.
A. Keep the caps off the hoses.
B. Make sure the caps are off from the hoses.
C. Take the caps off the flexible pipe.
A. Air filter needs to be replaced on regular maintenance schedule, because it often causes low flow through the equipment cooling supply system. Quickly release the tabs on the air filter housing cover to reach the filters.
B. Low flow through the equipment cooling supply system is caused by a contaminated air filter, therefore regular replacement is necessary, release the quick release tabs on the air filter housing cover to approach to the filters.
C. A blocked air filter which causes low flow through the equipment cooling supply system needs replacement on a regular maintenance schedule. Release the quick release tabs on the air filter housing cover to reach the filters.
A. This is the maximum portion of flammable vapors in air. If the portion is bigger, when an ignition source touched the gas, it would cause the fire to be diffused.
B. This is the minimum volume of flammable vapors. If the volume is lower, when the gas contacted with an ignition source, the fire would not come out.
C. This is the minimum density of flammable vapors in air. If the density was lower, when an ignition source touched the gas, it would not cause the spread of flame.
A. The delivery of the aircraft is required to ensure its airworthiness, therefore it is subject to customer inspection procedures.
B. The airplanes are airworthy because they were delivered in accordance with advised inspection procedures.
C. The airplanes are delivered with mandatory inspection procedures to ensure their airworthiness.
解析：这道题考察的是飞机交付时的检查程序对于保证飞机适航性的重要性。正确答案是B选项：The airplanes are airworthy because they were delivered in accordance with advised inspection procedures.
解析：这句话的意思是飞机之所以适航是因为它们在交付时按照建议的检查程序进行了交付。这说明飞机在交付时已经经过了必要的检查和程序，确保了它们的适航性。因此，选项B是正确的。
举个例子来帮助理解：就好比你买了一辆二手车，但是卖家告诉你这辆车在交付时已经按照建议的检查程序进行了检查，所以它是适合上路行驶的。这样你就可以放心地驾驶这辆车，因为它在交付时已经确保了安全性。所以，飞机交付时的检查程序对于保证飞机的适航性非常重要。
A. Substitutes with different quality can be used.
B. You can not use substitutes with same quantity.
C. Equivalent substitutes are permitted to use.
A. When some new kind of situation occurs, the operator should communicate openly with the manufacturer. The manufacturer should supply the operator solid assistance.
B. When the new situation gets worse, it should build the open communication between the operator and manufacturer. The operator claims the situation to get the feedback from the manufacturer.
C. When something new happens, open interconnection should exist between the manufacturer and the operator. The operator should report to the manufacturer to obtain effective discount.
A. Make sure the wire in this position is able to unlock the parts.
B. The wire must be positioned so that the parts can oscillate freely.
C. Ensure the wire is positioned to create a locking motion on parts.
