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玻璃棉管保温层定额编号是()

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玻璃钢保护层定额编号是()

Din Tai Fung is known_____ a classy, high-end Chinese restaur

A. to
B. for
C. as
D. in

Din TaiFung, a famous restaurant chain from Taiwan, is known internationally ______ its steamed dumplings and high quality.

A. as
B. for
C. to
D. in

下列有关化学实验操作中“先”与“后”的说法正确的是:

A. 高锰酸钾加热制备氧气,用排水法收集满氧气后,先移出导管,后撤离酒精灯
B. 给试管加热时,先给试管来回均匀加热,再固定局部加热
C. 大量碱液流到桌上,先用稀醋酸溶液中和,后用抹布抹去
D. 点燃可燃性气体(如H2,CO,CH4)时,先检验气体纯度,后点燃
E. 测定溶液的pH时,先用蒸馏水湿润,后用玻璃棒蘸取溶液点在试纸中部,再与比色卡比较

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