研磨设备中的磨垫常采用（）。
A.五孔吸尘
B.六孔吸尘
C.八孔吸尘
D.九孔吸尘
参考答案：A, C, D
句型转换。
1．My brother was in the park just now.（对画线部分提问）
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2.I was born in BeiJing．（对画线部分提问）
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3．Tony was born in China.（改为否定句）
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4．Was he naughty?（作否定回答）
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5．She was born in the city of Nanjing.（改为一般疑问句）
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医院现代化
