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【单选题】
“墨迹天气”为何迟迟不发布实景天气功能?A.
市场发育不够
B.
没有前瞻性
C.
资金不充裕
D.
技术不过关
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举一反三
【单选题】Ammeters and voltmeters used in sinusoidal AC power systems indicate which of the following values of the waveforms measured?
A.
Peak value
B.
Root-mean-square value
C.
Average value
D.
Maximum value
【单选题】External shunts are sometimes used with ammeters to _______.
A.
increase meter sensitivity
B.
permit shunts with larger resistances to be utilized
C.
prevent damage to the meter movement from heat generated by the shunt
D.
enable the construction of a compact meter with a virtually unlimited range
【单选题】Ammeters and voltmeters used in sinusoidal AC power systems indicate which of the following values of the waveforms measured?
A.
Peak value
B.
Boot-mean-square value
C.
Average value
D.
Maximum value
【单选题】Ammeters and voltmeters used in sinusoidal AC power systems including which of the following values of the waveforms measured?
A.
Peak value
B.
Root mean square value
C.
average value
D.
Maximum value
【单选题】In the sinusoidal steady-state circuit, the readings of ammeters A 1 and A 2 are 3A and 4A, respectively, then the reading of A is A .
A.
5A
B.
7A
C.
1A
D.
-1A
【单选题】Ammeters must have a resistance, while voltmeters must have a resistance.
A.
high...low
B.
low...high
C.
low...low
D.
high...high
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