未知题型 机关、单位须每两年对所确定的国家秘密进行审核（）

单项选择题 流白玻璃需要更改速度的原因是什么（）

单项选择题 Nevertheless, while few expect China to surpass the United States in military power in the next two decades, many still see the crisis as ______ in economic and soft power relations.