He runs___ 30 minutes on the playground every evening ___ he goes to bed. Is it interesting? Gray is good at swimming. He goes to the___club three times a month in winter, and three times a week___ So he’s pretty ___.___ my classmates have good eating habits. They eat_...
某同学测定一根金属丝的电阻率.(1)先用多用电表粗测其电阻.将选择开关调到欧姆挡“×10”档位并调零,测量时发现指针向右偏转角度太大,这时他应该:a.将选择开关换成欧姆