【单选题】The viruses can cause all the following damages EXCEPT ______.
A.
low speed of the computer's functions
B.
ruin of the normal programs
C.
lack of information storage
D.
loss of all the information stored in the computers
【单选题】The most common source of excitation for synchronous motors is a/an _____.
【单选题】The expression 'warp speed' in the first paragraph is closest in meaning to ______.
【单选题】According to the passage, the tram way and multistory parking lots are ______.
【单选题】Which of the following is NOT the result of laboratory experiments?
C.
Irritability of the lungs
【单选题】The root "carbo" means
【单选题】A smoking exhaust from an operating diesel engine could be caused by( ).
A.
low sulfur content in the fuel
B.
a loose injector inlet connection
D.
high injection pressure
【单选题】Overspeed of the diesel engine driving an electric generator could cause ______.
D.
excessive exhaust temperatures