多项选择题
When will you use a handout when you deliver an academic presentation? A.
Your information is too detailed to fit on a slide. B.
You don’t want to talk too much. C.
You want your audience to have a full record of your findings. D.
You are not sure of your information.
When will you use a handout when you deliver an academic presentation? A.
Your information is too detailed to fit on a slide. B.
You don’t want to talk too much. C.
You want your audience to have a full record of your findings. D.
You are not sure of your information.
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单项选择题
R134a与R22相比错的是________。
R134a与R22相比错的是________。
A．与矿物油不相溶，必须用较贵的脂类油
B．标准沸点不够低，主要适用于空调装置
C．单位容积制冷量较小，相同制冷量压缩机尺寸更大
D．溶解水的能力强，不容易冰塞