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【单选题】
一个基元反应,正反应的活化能是逆反应活化能的 2 倍,反应时吸热 100 kJ·mol -1 ,则正反应的活化能是 (kJ·mol -1 )A.
100
B.
200
C.
300
D.
50
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【单选题】Tom was very worried because there was something wrong______ the car.
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of
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by
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A.
24．When Tom was very young ,he was ______ skateboarding, ______worried his parents a lot. A．in; that
B.
into; which
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fond of; that
D.
like; which
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血流通过房间隔缺损时
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右心房血流量增加
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三尖瓣相对关闭不全
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右心室流出道相对狭窄
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二尖瓣相对狭窄
【简答题】阅读理解。 Tom, an eight-year-old boy, was ill. He had a fever. His mother was very worried and took him to see a doctor. The doctor looked over Tom carefully and said,' Tom, nothing serious.' Then he gave...
【简答题】Pete Gary called Joe William,saying that he will be twenty minutes late. This phone is from __1_ to __2_ The message is __3_
【简答题】完形填空。 It was seven thirty. Supper was 1 an hour ago, but Tom still wasn't 2 . Mrs Brown was worried. She went to the door and 3 . Half an hour later, Tom got home. When he saw his mother, he said, 'I'...
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【单选题】Tom was very worried because there was something wrong______ the car.
A.
of
B.
with
C.
at
D.
by
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