单项选择题

A．10Ω, 600W
B．20Ω, 500W
C．20Ω, 2000W
D．10Ω, 200W

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单项选择题

采用氢氧化物沉淀法处理污水中金属离子时，最经济的化学药剂是( )。
A、氢氧化钠
B、石灰
C、碳酸钠
D、电石渣

多项选择题

When the speaker gives the hypothesis that Chinese young people are more and more concerned about national culture, which of the following evidence might be used to support the hypothesis? (多选）
A、Han Chinese clothing (汉服）has become more and more popular in some community activities of young people.
B、A large number of young people are seen in TV programs exhibiting their knowledge of Chinese classic poems.
C、Campus interviews indicate that majorities of young people are aware of their responsibility in inheriting national culture.
D、Young people are increasingly interested in practising calligraphy and Chinese painting.