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【单选题】
在一个密闭容器内有甲、乙、丙、物质，一定条件下充分反应，反应前后各物质的质量如表： 物质 甲 乙 丙 丁 反应前的质量/克 10 20 30 40 反应后的质量/克 待测 27 20 43 下列说法中不正确的是（ ）A.
反应后甲的质量为零
B.
该反应一定是分解反应
C.
甲可能是该反应的催化剂
D.
化学反应中乙：丙：丁的质量比为7：10：3
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【单选题】Can Loud Music Cause Hearing Impairment (损伤)? Have you ever gone to a concert and realized that your seats were right next to the booming speakers? Are you guilty(51)turning up the volume on your port...
A.
of
B.
for
C.
at
D.
on
【判断题】One can ask questions about the importance of friendship and social relationships to analyze a company's discourse community.
A.
正确
B.
错误
【简答题】在无线电波段划分中，长波是指波长在（）米的无线电波，其频率范围为10—10千赫。
【简答题】无线电广播中波段的频率范围是535 kHz到1605 kHz，试计算中波段电磁长的范围。
【单选题】Many young people don't work hard, and regret it later when the opportunity is gone.They only realize it________it is too late.
A.
when
B.
before
C.
in case
D.
until
【简答题】As you dash outdoors in the middle of winter, you might make it halfway down the block before realizing that your ears are freezing because you forgot your hat. Now, scientists have shown that even th...
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