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【单选题】
一般来说，煤层埋藏越深煤层瓦斯含量（）。A.
越大
B.
越小
C.
与煤层埋藏深度无关
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举一反三
【单选题】听力原文： Americans eat breakfast and lunch quickly unless it is a social, business or family occasion. The evening meal is usually longer and a time for families to gather together. Rushing through dayti...
A.
When the food is too hot.
B.
When they enjoy the food.
C.
When there is no one waiting.
D.
When they are eating with their families
【单选题】听力原文：Americans eat breakfast and lunch quickly unless it is a social business or family occasion. The evening meal is usually longer and a time for families to gather together. Rushing through daytime...
A.
Where Americans eat.
B.
What time Americans eat dinner.
C.
Why Americans eat in a hurry.
【简答题】Americans eat breakfast and lunch quickly unless it is a social business or family occasion. The evening meal is usually longer and a time for families to gather together. Rushing through daytime meal...
【简答题】从效率的观点来看,机械的自锁条件是____________________。
【简答题】B My cellphone rang while I was working on my computer. I looked at the phone and saw it was my 17yearold son, Tom. I quickly picked it up. “Mom, I got a 71 on the test. I did it.” With those few wo...
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