题目内容

AQI指数值越大表明综合污染程度越轻。

A. 对
B. 错

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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

Listen to the conversation and choose the correst answer.

A. $157.4
B. $15.74
C. $175.4
D. $17.54

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