RLC串联电路在ω=1000rad/s时，UL=4UC。则此电路的谐振频率ω0=______。
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一实际通信电路中的并联谐振电路如图所示，其品质因数Q=______。
法院应当在什么时间内立案？
A. 2月13日内
B. 2月15日内
C. 2月17日内
D. 3月20日内
Which two visits of Halleys Comet can be inferred from the comet orbiting rules in the discussion？[Clink on 2 answers. ]
A. The visit of Halley"s Comet was in 1956.
B. The visit of Halley"s Comet will be in 2138.
C. The visit of Halley"s Comet was in 1910.
D. The visit of Halley"s Comet was in 2137.
According to Paragraph 1, which of the following best explains the main idea of the book？
A. U. S. government has made progress in reducing the carbon-dioxide gas.
B. Major automakers will do something to reduce the pollution produced by cars.
C. The gas emitted by cars is the source of American air pollution.
D. People should take measures to reduce air pollution.
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