Generally speaking, the structure of an essay includes _______.
A. introduction
B. body
C. conclusion
D. paragraphs
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When selecting examples for an essay, you should ________.
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
已知HOAc的pKa =4.74，则0.10 mol·L-1HOAc溶液的pH为2.87。（ ）
A. 对
B. 错
已知HOAc的pKa =4.74，则0.15 mol·L-1NaOAc溶液的pH为8.96（ ）
A. 对
B. 错
已知NH3·H2O的pKb=4.74，则0.10 mol·L-1NH3·H2O溶液的pH为11.13。（ ）
A. 对
B. 错
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