精炼炉升温期冶炼过程温度控制的原则:采用较高电压,较大电流()
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The policeman came up to the lonely house with the door _______, _______ there for a while and then entered it.
A. open; to stand
B. opening; stood
C. open; stood
D. opened; standing
精炼炉初期冶炼过程温度控制的原则:以造渣为主。宜采用低级电压,中档电流加热至电弧稳定()
联系实际谈谈班主任在转化后进生的工作中应为其创造哪些条件?