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【简答题】
利用一支温度计，一个小烧杯，一瓶酒精，设计一个实验，证明：酒精蒸发过程中吸热，请你写出实验步骤和实验现象．
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举一反三
【简答题】滴定分析按照化学反应类型可以分为哪几类?
【单选题】In recent years, Ivy League schools have accepted a wider range of students because _______.
A.
they needed professional sportsmen
B.
they were unsuccessful at research
C.
they were thought to be too socially elite
D.
it wasn’t possible to be both world-famous for
【单选题】联合收割机收割谷物时,将谷粒从谷物中脱落下来并与茎秆初步分离的是( )。
A.
联合收割机脱粒装置
B.
联合收割机割台
C.
联合收割机分离装置
D.
联合收割机清选装置
【单选题】In recent years, Ivy League schools have accepted a wider range of students because ____.
A.
they needed professional sportsmen
B.
they were unsuccessful at research
C.
they were thought to be too socially elite
D.
it wasn’t possible to be both world-famous for research and top-class in sport
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