反义词
光明──____ 沉──____ 颓然—____
—Did you have fun _____________ on your last day off?
—No, I didn't. there were too many people and it was really crowded.
电阻R1、R2串联接在电路中,R1两端的电压为3伏,R2两端的电压为9伏,R1+R2=600欧,求:
已知一个空间几何体的三视图如图所示,根据图中标出的尺寸,可得这个几何体的全面积为____