多项选择题

In an experiment, 7.81 g Al2O3 and excess HF(g) were dissolved in 3.50 L of 0.141 M NaOH. If 28.2 g Na3AlF6 was obtained, then what is the percent yield and theoretical yield for this experiment? Al2O3(s)＋ 6 NaOH(aq)＋12 HF(g)2→ 2Na3AlF6(s)＋ 9 H2O(l)

A．0.816
B．0.8163
C．34.5g
D．34.55g

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单项选择题

Math对象的（）方法是返回x的平方根？
A、cos(x)
B、round(x)
C、sin(x)
D、sqrt(x)

单项选择题

抗酸染色后，抗酸性细菌被染成紫色，非抗酸性细菌被染成红色。（）

A．对
B．错