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【判断题】
血液中HCO-3和H2CO3是最重要的缓冲对A.
正确
B.
错误
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皮皮学刷刷变学霸
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【单选题】We are now ______ of your order of June 19.
A.
in receipt of
B.
upon receipt of
C.
on receipt of
D.
in reception of
【简答题】一、英语信函翻译 Dear sirs, We are very glad to have your letter of July 23 and to hear that you are interested in our building nails. In reply, we regret that we are not in a position to meet your requiremen...
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