问题
选择题
All these changes will lead to ____ stronger and more Powerful China, ____ country that can help enrich the planet.
A．a ; a
B．a : the
C．the :a
D．the : the
答案
答案：A
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All these changes will lead to ____ stronger and more Powerful China, ____ country that can help enrich the planet.
A．a ; a
B．a : the
C．the :a
D．the : the
答案：A
R4V4O12+4OH−（以ROH为强碱性阴离子交换树脂）。为了提高洗脱效率，淋洗液应该呈（）性（填“酸”“碱”“中”）。