单项选择题

2.The British government required the colonists tolodge and feed British soldiers in their homes. A.
a. provide food B.
b. provide housing C.
c. both a and b

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水电站与火电站相比，水电站机组启动时间较短。

答案：正确

多项选择题

硅基太阳电池的正表面要生长一层富氢氮化硅薄膜，起到（）作用。