如图所示,一电场的电场线分布关于y轴(沿竖直方向)对称,O、M、N是y轴上的三个点,且OM=MN.P点在y轴右侧,MP⊥ON.则( )
A:M点的电势比P点的电势低
B:将负电荷由O点移动到P点,电场力做正功
C:M、N两点间的电势差大于O、M两点间的电势差
D:在O点静止释放一带正电粒子,该粒子将沿y轴做直线运动
化学式
颜色状态
酸碱性
加热
滴加稀盐酸
滴加硝酸银溶液
NaCl
白色固体
中性
受热不分解
无明显变化
生成白色沉淀
NaNO2
弱碱性
320℃以上分解生成刺激性气味的气体
生成红棕色气体
① Look at the pigs. ____ A. Baa…baa…!
② It’s a white sheep. ____ B. Moo…moo…!
③ I can hear a horse. ____ C. Oink…oink…!
④ I have a duck. ____ D. Neigh…neigh…!
⑤ I can see a cow. ____ E. Ouack…quack…!
列竖式计算,带☆的要验算。
①565÷5=
②896÷8=
③☆514÷2=
It is necessary to relax ourselves after the exam. There are some kinds of activities for us to take part in. First of all, we can go for a w____ along the bank of the river. We can also go to the movies or listen to music. What's more, joining in a sports club is a good c____, which can keep us healthy. For example, p____ football in the afternoon may relax ourselves. Above all, we should arrange(管理) our time p____ and live a regular(规律的) life. I hope all of us can have a wonderful time.