B: During the first days of the Spring Festival holiday, pollution levels aren't ____ ____ ____ they were last year.
已知Na2O2为淡黄色粉末,常温下可与H2O剧烈反应,化学方程式为2Na2O2+2H2O═4NaOH+O2↑,因此Na2O2可用于制取O2.
根据以上信息回答下列问题:
实验不是毫无选择地测量,它需要 。特别重要的,是要 ,以作为整个探索过程的向导。至于这目标怎样选定,就要 。