A:Na+、OH—、S 2—、ClO—
B:H+、Na+、Fe2+、NO3—
C:K+、Ba2+、OH—、SO32—
D:Na+、K+、Ba2+、OH-
mào shèng
liú liàn
shù shāo
bō zhe jiǎng
____
__________ the children have fun, parents can take dance lessons on the beach.
—The final round of the competition is coming near. Can I really do well this time?—Believe in ______. You're always the best in our school.
某学习小组在讨论“变化的鱼”时,知道大鱼与小鱼是位似图形(如图所示).则小鱼上的点(a,b)对应大鱼上的点( )
宋代社会的基础是文官政治。在重文轻武的国策背景下,有较高社会地位的是( )