In my driving lesson, I learned a traffic rule that at no time _____ parked in a manner which will block emergency service.
A:any vehicle is
B:is any vehicle
C:can any vehicle be
D:any vehicle can be
____> 66。
如图,在Rt△ABC中,∠C=90°,D为AC上一点,且DA=DB=5,又△DAB的面积为10,那么DC的长是( )
在“测量小灯泡的额定功率”的实验中,已连接的部分电路如图甲所示,图中电源电压恒定,小灯泡上只能看到“2.5V”字样.