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【单选题】
经空调制冷系统降温后的空气，下列说法正确的是（ ）。A.
绝对含水量肯定下降
B.
相对温度不一定下降
C.
相对温度一定下降
D.
相对温度会保持不变
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【简答题】As a high school athletics coach, I gave a speech about football to students and parents, aiming at getting new team members :I talked about how'everyone can benefit from football. This year, a worr...
【多选题】以下哪些句子是宾语从句,请选择
A.
I don’t know that girl.
B.
I think that Jenny knows the answer.
C.
I hope that we can have lunch together.
D.
My coach told me that I should eat some vegetables and fruit for supper.
E.
This is your desk. That is mine.
F.
She always talks like that.
【简答题】反应的速率常数k的物理意义是什么？当时间单位为h，浓度单位为mol·L -1 ，对一级、二级和零级反应，速率常数的单位各是什么？
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