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问题 单项选择题

在多级放大器电路中，各级之间常接有去耦滤波电路，其目的在于（）。

A.改善放大器输出波形

B.避免因电源内阻的耦合作用引起自激

C.防止外界电磁辐射造成的干扰

D.滤除电源的波纹电压

答案

参考答案：B

阅读理解

Healthy eating begins with learning how to “eat smart”. It’s not just what you eat，小题1:.　　　　 how you eat. Pay attention to what you eat and choosing foods that are both nourishing小题2:　　　　 enjoyable  helps support an overall healthy diet.

Take time to chew your food： Chew your food slowly， savoring every bite. We tend to rush through our meals， forgetting to actually taste the flavors and feel the textures(质地) of 小题3:　　　 is in our mouths. Reconnect with小题4:　　  joy of eating.

Avoid stress while eating：  Avoid eating while working， driving， arguing， or watching TV. Try taking some deep breaths  before beginning your meal， or light candles and play soothing music to create a relaxing atmosphere.

Listen to your body： Ask 小题5:　　　　 if you are really hungry. You may really be thirsty， so try drinking a glass of water first. During a meal， stop eating before you feel full. It actually takes a few minutes 小题6:　　　　 your brain to tell your body that it has had 小题7:　　　　 food， so eat slowly.

Eat early： Starting your day小题8:　　　　 a healthy breakfast can jumpstart your metabolism(新陈代谢)， and eating early in the day gives your body time to work those calories off.
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填空题

在SQL的SELECT查询中，HAVING子句不可以单独使用，总是跟在______子句之后一起使用。
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