题型:选择题 You be hungry after the long walk.Help yourself to some cakes.A.can’tB.shouldn’tC.needD.must 查看答案
题型:选择题 _____is wrong with my watch. It has stopped _____[ ]A. Something; working B. Something; to workC. Anything; working D. Anything; to work 查看答案
题型:选择题 如图所示,把电阻、电感器、电容器并联接到一交流电源上,三个电流表的示数相同.若保持电源电压不变,而将频率加大,则三个电流表的示数I1、I2、I3大小的关系是:( )A.I1=I2=I3B. I3>I1>I2 C.I2>I1>I3D. I1>I2>I3 查看答案