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单项选择题
I wrote a letter to the car dealer, ____ what had happened to my car.( )
A.explaining
B.toexplain
C.explains
D.explained
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抗震设计时,普通砖、多孔砖和小砌块砌体承重房屋的层高[h1]、底部框架-抗震墙砌体房屋的底部层高[h2],应不超过下列何项数值?( )
A.[h1]=4.2m,[h2]=4.8m
B.[h1]=4.2m,[h2]=4.5m
C.[h1]=3.6m,[h2]=4.8m
D.[h1]=3.6m,[h2]=4.5m
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下面关于方向导数和梯度的表达式中正确的是
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单项选择题
I was____ the middle of my call because I had no more pennies to put in the box.(
A.brokenin
B.hungup
C.cutoff
D.putdown
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