题目内容

0.20mol·L-1NaCO3的pH(H2CO3的pKa1=6.38,pKa2=10.25)为11.77。( )

A. 对
B. 错

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Which of the following is not a Transitional Phrase?

A. for example
B. in case
C. on this occasion
D. as an illustration

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A. which
B. that
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D. this

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A. introduction
B. body
C. conclusion
D. paragraphs

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A. select the examples that are relevant and persuasive
B. try to choose typical examples
C. use the formal words
D. use the informal words

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