20.下列说法正确的是( )
0 284583 284591 284597 284601 284607 284609 284613 284619 284621 284627 284633 284637 284639 284643 284649 284651 284657 284661 284663 284667 284669 284673 284675 284677 284678 284679 284681 284682 284683 284685 284687 284691 284693 284697 284699 284703 284709 284711 284717 284721 284723 284727 284733 284739 284741 284747 284751 284753 284759 284763 284769 284777 366461
| A. | 单项式乘以多项式的积可能是一个多项式,也可能是单项式 | |
| B. | 单项式乘以多项式的积仍是一个单项式 | |
| C. | 单项式乘以多项式的结果的项数与原多项式的项数相同 | |
| D. | 单项式乘以多项式的结果的项数与原多项式的项数不同 |