猜你喜欢
- 1若元素原子核外有4个电子层,最外层有2个电子.满足上述条件的元素的元素符号
- 21mg等于多少毫克
- 3一篇半命题作文,怀念XX,800字左右
- 4改错 the love story took place in France, an European country, which is full of r
- 5证明大气压存在最著名的实验叫______
- 6this is____(与以前一样).英文翻译.
- 7化学电荷守恒规律中:[Na+]+[H+]=2[CO3 2-]+[HCO3-]+[OH-]
- 8小明的爸爸骑着摩托车带着小明在公路上匀速行驶,小明每隔一段时间看到的里程碑上的数如下:
- 9已知地球半径R,自传周期T,地球表面重力加速度g,则地球同步卫星第环绕速度为多少?
- 10That day I saw some parents ______ at the back of the classroom ______to the teacher.