Fog forms when the air（）.
A. is 50% water saturated
B. is 90% water saturated
C. temperature is greater than the dew point temperature
D. temperature is equal to，or below the dew point temperature
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类风湿关节炎的关节表现中哪个为最早的症状（）？
A. 关节肿
B. 关节畸形
C. 关节痛
D. 关节功能障碍
E. 都不是
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