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【单选题】
接触器自锁触头是一对( )A.
开辅触头助头
B.
常闭辅助触头
C.
主触头
D.
常闭触头
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A.
when
B.
what
C.
which
D.
that
【单选题】反应3O2 → 2O3,其速率方程 -d[O2]/dt = k[O3]2[O2] 或 d[O3]/dt = k'[O3]2[O2],那么k与k'的关系是:
A.
2k = 3k'
B.
k = k'
C.
3k = 2k'
D.
½k = ⅓k'
【简答题】PASSAGE TWO One night last July, my 12-year-old car died on California's Santa Ana Freeway. It was an hour before sunset, and I was 25 miles from home. I couldn't reach anyone to pick me up, so I deci...
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【简答题】Passage Two One night last July, my 12-year-old car died on California's Santa Ana Freeway. It was an hour before sunset, and I was 25 miles from home. I couldn't reach anyone to pick me up, so I deci...
【单选题】反应3O2→2O3,其速率方程-d[O2]/dt=k[O3]2[O2]或d[O3]/dt=k'[O3]2[O2],那么k与k'的关系是:
A.
2k＝3kˊ；
B.
k＝kˊ；
C.
3k＝2kˊ；
D.
1/2k＝1/3kˊ
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