Each group of words below has one general idea and three specific ideas. The general idea includes all the specific ideas.Choose the letter of the general idea.
A. communicating
B. writing
C. reading
D. speaking
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Each group of words below has one general idea and three specific ideas. The general idea includes all the specific ideas.Choose the letter of the general idea.
A. hurry up
B. get to bed
C. commands
D. clean up this mess
使用数字万用表测量电流时，表笔与电路（）；测量电压时，表笔与电路（）；
A. 串联，并联
B. 并联，串联
C. 混联，并联
D. 串联，混联
电路的作用为（）
A. 传递热能
B. 运输
C. 提高热量
D. 传递控制信号
测量蓄电池12v电压选择合适的万用表的量程为（）档
A. 交流200V
B. 直流200V
C. 直流20V
D. 交流20V
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