你想问别人喜欢果冻吗?可以说:
A:Do you like biscuits?
B:Do you like jelly?
读课文《七色花》,七色花神奇在哪里?
-–Why not get your husband a new energy car for his birthday?
—_______ That's too expensive.
如图所示,电源电压为10V,R′的最大电阻值是R的3倍,滑片P在b点时电流表的示数比P在ab中点时减小了0.1A,那么R的值为( )