AQI指数值越大表明综合污染程度越轻。
A. 对
B. 错
AQI的计算是从各项污染物的IAQI中选择最大值确定为AQI。
A. 对
B. 错
Listen to the conversation and choose the correst answer.[音频]
A. $20.5
B. $12.5
C. $2.5
D. $20
Listen to the conversation and choose the correst answer.
A. $15.95
B. $50.95
C. $55.95
D. $15.59