(2010)常温下,在CH3COOH与CH3COONa的混合溶液中,若它们的浓度均为0.1Omol·L-1,测得pH是4.75,现将此溶液与等体积的水混合后,溶液的pH值是:()
A. 2.38
B. 5.06
C. 4.755.25
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环境评价分为环境()评价。其中前者主要是用于工程可行性判断的环境预测,后者则贯穿与工程建设的整个过程。
The operation between two fuel injections is called a working cycle, which consists of a fixed sequence of eventsWhat does "which" mean in this sentence?()
A. a working cycle
B. the operation
C. two fuel injections
D. event
怎样用10点/像素的大小增大/减少字体尺寸()。
A. 上/下方向键
B. 按Shift+上/下方向键
C. 按Alt+上/下方向键
D. 按Ctrl+上/下方向键