根据视频内容,判断句子正误。Roast duck has history of 2100 years.
查看答案
Hot Pot has a history of more than 1,700 years in China.
A. 对
B. 错
Noodleshas a history of more than 1900 years in China.
A. 对
B. 错
进行电路装配时,三相电源的L1、L2、L3三相分别用( )色、( )色、( )色电缆。
主回路的连接线一般采用较粗的( )mm²单股塑料铜芯线,控制回路一般采用()mm²的单股塑料铜线。