用通用手势信号表示"微动范围"应当是:双小臂曲起,伸向一侧,五指伸直,手心相对,其间距与负载所要移动的距离接近。
参考答案：对
一个灯泡的灯丝的电阻是4Ω，当它两端的电压是3V时，求通过灯泡的电流．
Bill doesn't watch TV_____ every day. He watches TV only _____ Sunday. [ ]
A. / , on
B. in, on
C. / , in
D. in, /
