题目内容
The first major wall was built during the reign of Emperor _______ in the third century BC.
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In 1987, the Great Wall was listed by UNESCO as a World Cultural Heritage Site.
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）（）
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