题干
口算.
−
=____
−
= ____
+
=____
| 1 |
| 4 |
| 1 |
| 8 |
| 5 |
| 6 |
| 2 |
| 3 |
| 1 |
| 3 |
| 2 |
| 5 |
状遗传的主要物质是