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=______。
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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.
According to Paragraph 1, why is the use of money as a medium of exchange of commodities helpful for economy？
A. Because money uses less precious metals like gold and silver.
Because money spares sellers and buyers the time and effort to find another seller.
C. Because money is considered as a milestone of modern economic life.
D. Because it is very convenient to produce money with natural metals.
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