Jiangsu, especially Suzhou is one of the four districts that produce best embroidery.
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Dragon and phoenix are common images in Guangdong Embroidery.
A. 对
B. 错
单体蓄电池的电压值为
A. 1.5v
B. 2v
C. 6v
D. 12v
铅酸电池的电解液为
A. 硫酸溶液
B. 盐酸溶液
C. 醋酸溶液
D. 氢氧化钠溶液
铅酸蓄电池正极板的活性物质是(),负极板的活性物质是()。