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【多选题】
沥青蹄脂碎石路面结构组成中“三多一少”中“三多”指的是A.
粗集料多
B.
细集料多
C.
矿粉多
D.
沥青多
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知识点：
皮皮学刷刷变学霸
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】从效率的观点来看,机械的自锁条件是____________________。
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