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【单选题】
单相桥式可控整流电路电阻性负载,晶闸管中的电流平均值是负载的( )倍A.
（ A）0.5
B.
（ B）1
C.
（ C）2
D.
（ D）0.25
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举一反三
【单选题】A car is traveling at 30 m/s. The driver applies the brakes, and the car uniformly decelerates at 9 m/s2. How far does the car travel before coming to a complete stop?
A.
2 m
B.
50 m
C.
100 m
D.
200 m
E.
450 m
【单选题】A speeder traveling at a constant speed of 100 km/hr passes a waiting police car that immediately startsfrom rest and accelerates at a constant 2.5 m/s^2.How fast will the police car be traveling when...
A.
200 km/hr
B.
210 km/hr
C.
220 km/hr
D.
190 km/hr
E.
180 km/hr
F.
230 km/hr
【单选题】The pumps employed on board the ship can be divided into two main categories i.e_____pumps and centrifugal pumps.
A.
gear
B.
non positive displacement
C.
positive displacement
D.
rotary
【单选题】The pumps employed on board ship can be divided into two main categories i. e.______ pumps and centrifugal pumps.
A.
gear
B.
Non-positive displacement
C.
positive displacement
D.
Rotary
【单选题】A car is traveling at an unknown velocity. It accelerates constantly over 5.0 s at a rate of 3.0 m/s2 to reach a velocity of 30 m/s. What was the original velocity of the car?
A.
1.0 m/s
B.
5.0 m/s
C.
10 m/s
D.
15 m/s
E.
20 m/s
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