A、 If there is hum from the loudspeaker, don＇t adjust the potentiometer.
B、 Adjust the potentiometer unless hear a hum from the loudspeaker .
C、 Adjust the potentiometer until the loudspeaker no longer hums.
答案：C
A、 If there is hum from the loudspeaker, don＇t adjust the potentiometer.
B、 Adjust the potentiometer unless hear a hum from the loudspeaker .
C、 Adjust the potentiometer until the loudspeaker no longer hums.
答案：C
A. Your skin and lungs can be protected.
B. Your skin and lungs can be harmed.
C. Your skin and lungs can be harmed suddenly.
A. Utilize the dimmer switch and ensure that the light＇s luminosity varies vigorously.
B. Manipulate the dimmer switch to confirm the alteration of the light＇s intensity.
C. Activate the dimmer switch and ascertain that the light＇s intensity undergoes little changes.
A. Check all parts with clear defects in accordance with standard industry practices.
B. Check all parts for visible defects in accordance with standard industry practices.
C. Check all parts for serious defects in accordance with standard industry practices.
A. After pressing the LSK next to EXIT, the BITE will take you out of BITE test and the airplane will return to its normal condition.
B. The BITE will continue the BITE test and the airplane will go back to its usual condition when you push the LSK next to EXIT.
C. The BITE will proceed the BITE test and the airplane will go back to its normal configuration after releasing the LSK that is adjacent to EXIT.
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. Before restarting the engine, make sure to clear the ground from any fuel spills.
B. Remove all spilled fuel from the ground before making the first attempt to start the engine.
C. Ensure that no fuel on the ground is eliminated before proceeding with engine startup.
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.
A. Soak the element for two hours.
B. Wet the element for two hours.
C. Stove the element for two hours.
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. Detach the sensor to establish a physical connection with the adjoining structure.
B. Install the sensor to block access to the adjacent structure.
C. Take out the sensor to reach to the neighboring structure.
