题目内容

已知HOAc的pKa =4.74,则0.15 mol·L-1NaOAc溶液的pH为8.96( )

A. 对
B. 错

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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

已知NH3·H2O的pKb=4.74,则0.15 mo1·L-1NH4Cl溶液的pH为5.04。( )

A. 对
B. 错

Which of the following statement is TRUE about writing an application letter?

A. The letter should be addressed to a specific individual.
B. You may brag and boast your own ability and qualification.
C. You should provide your contact and request an interview.
D. Specify the job you want.

对无粘性土的工程性质影响最大的因素是( )。

A. 含水率
B. 密实度
C. 矿物成为
D. 塑性指数

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