We should try to help the ____________ because they have an illness which makes it difficult for them to move around.
A:disabled
B:worried
C:moved
如图所示,自由电子在金属导体中的定向移动,跟水在塞满石头的水管中的流动类似,会受到阻力.下面是几位同学根据“水管﹣﹣石头模型”的理解和对决定电阻大小因素的猜想,下列说法中错误的是( )
罪恶的“三角贸易”航程路线是( )