A:鸡蛋清
B:面团
C:砂糖
D:鱼片
His family__________ all very kind and friendly. His family__________ a happy one.
如图所示的电路,电源电压保持不变。电阻R0的阻值是30W。当滑动变阻器接入电路的电阻为10W时,电流表的示数I;要使电流表的示数变为原来的一半,滑动变阻器连入电路的阻值应是()
Touch your ________.