The purpose of designing some waste heat boilers with sinuous fire tubes, is to（）
A. increase exhaust gas velocity through the boiler
B. reduce accumulations of carbon deposits on the heat transfer surfaces
C. eliminate exhaust gas pulsations and noise
D. increase the rate of heat transfer to the waterside
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堪称“我国设立幼儿教育机构之始”的是1903年在武昌成立的（）。
She asked me whether（）English.
A. was I
B. am I
C. are you
D. I wa
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