第12题: [单项选择]{{B}} Questions 11 to 18 are based on the conversation you have just heard.{{/B}} A. The air is heavily polluted. B. She’d like to have the windows open. C. She likes to have the air conditioner on. D. The windows are already open. 参考答案:B
第31题: [单项选择]用于污染较重、尤其是有机物污染、物品结构复杂表面不光滑物品的清洗() A. 自来水清洗 B. 清洁剂 C. 酶清洗剂 D. pH<7的洗涤剂 E. pH>7的洗涤剂 参考答案:C 答案解析:自来水清洗适用于污染较轻、无有机物污染、表面光滑物品的清洗。第1小题选A。酶清洗剂主要用于污染较重、尤其是有机物污染、物品结构复杂表面不光滑物品的清洗。第2小题选C。pH<7的洗涤剂主要用于无机污物的