①C溶液滴入另外三种溶液中,均无明显现象;
②D和B反应生成的气体能被A吸收;
③A和D反应生成的气体能被B吸收.
试回答下列问题:
如图所示,R1=25Ω,小灯泡L的规格为“2.5V 0.3A”,电源电压保持不变.
①S1、S2都断开时,小灯泡L正常发光,求电源电压;
②S1、S2都闭合时,电流表示数变为0.6A,求R2的阻值.
Hello! I'm Victor.I have a bed, a desk, two chairs and a computer in my bedroom.My bed is small but very nice.It's blue because I like blue very much.My desk is big.It's white.You can see a computer and so many books on it.I do my homework here.I have two chairs.One is big and one is small.The big one is near the bed.The small one is near the window.I like my room.
“你幸福吗?”“我姓曾。”央视《走基层·百姓心声》节目中看似文不对题,却令人遐想连篇的回答在网络火速走红,由此可见人们对幸福生活的追求与向往。请你为使人民过上更加幸福美好的生活提几点建议?
我们无法选择漂亮的外貌,但是我们可以通过努力完成我们的品德、修养,从而使我们的人生更加亮丽。( )