A:物像小,视野高,看到的细胞数目多
B:物像小,视野暗,看到的细胞数目少
C:物像大,视野暗,看到的细胞数目少
D:物像大,视野亮,看到的细胞数目多
We have done much to protect the environment. So the river is getting than before.
A.小苏打 B.武德合金 C.硝酸钾 D.熟石灰 E.维生素 F.肥皂水 G.生石灰 H.干冰