16.人体内成熟的红细胞的平均直径为0.0000077米,用科学记数法表示为( )
| A. | 0.77×10-7 | B. | 7.7×10-7 | C. | 0.77×10-6 | D. | 7.7×10-6 |
13.据报载,2016年研究生考试报考人数为1770 000人,其中1770 000用科学记数法表示为( )
0 286551 286559 286565 286569 286575 286577 286581 286587 286589 286595 286601 286605 286607 286611 286617 286619 286625 286629 286631 286635 286637 286641 286643 286645 286646 286647 286649 286650 286651 286653 286655 286659 286661 286665 286667 286671 286677 286679 286685 286689 286691 286695 286701 286707 286709 286715 286719 286721 286727 286731 286737 286745 366461
| A. | 0.177×107 | B. | 1.77×106 | C. | 17.7×105 | D. | 177×104 |