第2题: [单项选择]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 参考答案:D
第3题: [多项选择]话单格式有哪些?() A. ASN.1格式 B. 文本格式 C. 二进制格式 参考答案:A, B