题目内容
In 1987, the Great Wall was listed by UNESCO as a World Cultural Heritage Site.
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The initial construction of the Summer Palace began in 1750, commissioned by Emperor Qianlong as a gift for his mother on her birthday.
The Tiananmen Gate Tower stands imposingly at the western end of the square.
HCl和NH4Cl两种溶液混合后，它们的浓度分别为0.010mol·L-1和0.05mol·L-1，此混合溶液的pH值为（NH3的Kb=1.79×10-5）（）
人体血液的pH值总是维持在7.35～7.45这一狭小的范围内。其主要原因是由于（ ）
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