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1Baseball enthusiasts hold softball in low esteem. 2 lt's a picnic game, they argue, with a big, soft ball, shorter base paths, and a pitcher who throws underhand. 3Yet fast-pitch softball can be as intense and dramatic as any baseball game, perhaps moreso.4True,thebasepathsareshorter, butaskanythirdbasemanhowquicklyawell-hit groundball reaches him on softball's smaller diamond. 5True, the pitcher throws underhand, but he stands fifteen feet closer to the plate, and he might hit speeds exceeding eighty miles per hour. 6True, the ball is softer than a baseball, but catch a hard one in the ribs just once, and such knowledge is smallcomfort.

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1For many years, there has been a section in Reader's Digest magazine called "Laughter, the Best Medicine." 2The name is not such an exaggeration—medical studies show that laughter is good for one's physical and emotional health.3Ahearty laugh exercises the internal organs, including the heart and lungs. 4The deep breathing that accompanies laughter supplies your body with extra oxygen. 5Many diseases deplete the body's supply of oxygen, so getting extra oxygen is important. 6Laughter may also stimulate the body's production of endorphins, which act as painkillers and antidepressants.

从高频已调信号中恢复出原调制信号的过程的过程称为()又称为()。

反馈型振荡器的振荡频率与谐振回路的谐振频率()。

A. 相等
B. 不相等
C. 近似相等
D. 没有关系

振荡器是一种能自动的将()电源的能量转变为特定频率和振幅的()能量的电路。

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