It's very warm. You ______ to wear the coat.
在图1中画出光线经过凸透镜后的光路图(O为光心,F为焦点);在图2中,根据通电螺线管的N、S极,分别标出电源的正负极和两个小磁针静止时的N、S极.
I know he's been curious about everything, but that's . Be patient!
“吸进的是白色粉末,吐出来的是自己的生命。”这句话形象地说明了()