单项选择题

高氯酸可以与浓硫酸混合使用溶解钢铁样品
A、正确
B、错误

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不定项选择

一门艺术形成套路往往就是衰亡的开始。

A．正确
B．错误

单项选择题

At first, she wasn’t used ( ) and would find excuses for her mistakes. A. to be criticized B. to criticizing C. to being criticized D. to criticize