A:相交
B:相外切
C:相离
D:相内切
Don’t worry _______ your cat.I can look after it.
Everything in the hall is large.
选出你所听到的单词( )
如图所示的电路中,电源的电动势E和内阻r恒定不变,电灯L恰能正常发光,如果滑动变阻器的滑片向b端移动,则( )