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【判断题】
Bioling point elevation is a collagitive property related to the vapor pressure lowing.A.
正确
B.
错误
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【单选题】翻译“指南针、火药、造纸术、活字印刷术等四大发明,是中国古代对世界文明做出的杰出科技贡献。”
A.
Four great inventions,namely, compass, gunpowder, paper and printing, were ancient China‘s outstanding scientific and technological contributed to world civilization.
B.
Four great inventions ,namely, compass, gunpower, paper and printing, were ancient China‘s outstanding scientific and technological contributed to world civilization.
C.
Four great inventions ,namely, compass, gunpowder, paper cutting and printing, were ancient China‘s outstanding scientific and technological contributed to world civilization.
【简答题】变压器的原绕组880匝,接在220V的交流电源上,要在副绕组上得到6V电压,副绕组的匝数应是______,若副绕组上接有2Ω的电阻,则原绕组中的电流为______。