—This is your order, a sandwich and an apple pie. ?
— I'll have it here.
A:For here or to go
B:Something to drink
C:Anything else
D:Is that OK
如图所示,要使灯泡L1和L2组成并联电路,应
用如图所示的滑轮组在10s内将300N的重物匀速提升3m,已知动滑轮重30N,不计绳重和摩擦,则拉力大小为____N,拉力的功率为____W.
设a>1,则log0.2a、0.2a、a0.2的大小关系是( )