微波RFID常见的工作频率是MHz、MHz、GHz和GHz等，该系统可以同时对多个电子标签进行操作，主要应用于需要较的读写距离和较读写速度的场合。
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___ can help promote the overall functioning of the heart, lungs, stomach and muscles.
A. Stressed movements and deep breathing
B. Stressed movements and short breathing
C. Relaxed movements and deep breathing
D. Relaxed movements and short breathing
When should you avoid practicing Taiji Quan?
A. Immediately after a meal.
B. When you have any type of infection.
C. When you’re tired.
D. An hour after a meal.
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