由同种材料制成的两根电阻丝,已知它们的长度关系L1>L2,横截面积的关系为S1<S2,则它们的电阻R1____ R2 。(填“<”或“>”或“=”)
下列诗句中,形象的反映了我国北方地区冬季景观的是( )
Many people do not realize the importance of health __________ they have fallen ill.
下列与人体的生理活动有关的叙述中,正确的是( )
I have to work with him, because he always makes ____ (care) mistakes.