第7题: [单项选择]What did the woman do this morning A. She had the cooker changed. B. She had her cooker repaired. C. She bought a new cooker. D. She returned her new cooker. 参考答案:A 答案解析:M: What’’s wrong with your new electric cooker Let me see if I can fix it.
W: Oh, I had the shop r
第33题:[多选题] 与铅酸蓄电池电动势有关的因素有( )。[1.0分] A. 当极板活性物质已经固定,则蓄电池的电动势主要由电解液浓度来决定 B. 蓄电池电动势的大小与板栅大小有关 C. 蓄电池电动势的大小与极板上活性物质的电化性质和电解液浓度有关 D. 蓄电池电动势的大小由正负极板大小决定 参考答案:AC