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【单选题】
下列各组中，两种气体的分子数一定相等的是（ ）A.
温度相同、体积相同的O 2 和N 2
B.
体积相等、密度不等的CO和C 2 H 4
C.
质量相等、密度不等的N 2 和C 2 H 4
D.
压强相同、体积相同的N 2 和O 2
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反馈参考答案：
举一反三
【单选题】If you still have any other questions, please _______ your hands [ ]
A.
put up
B.
put down
C.
put on
D.
put off
【简答题】Please put up your hands if you have any questions.（ ）
【单选题】If you have any questions, please ()your hands.
A.
put out
B.
put up
C.
put on
D.
put down
【单选题】----Have you put your hands ________a job? -----No, I have applied ________several companies, but none has given me an answer.
A.
with; to
B.
with; for
C.
on; to
D.
on; for
【简答题】阅读理解。 Hands play an important part in our daily life. But do you know which of your two hands you use more? Very few people use both hands equally well. Most of us are right-handed. Only about five pe...
【简答题】How long should you put your hands into hot water to relief your headache? For ______.
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