16.以下列数组为边长的三角形,恰好是直角三角形的是( )
| A. | 4,6,8 | B. | 4,8,10 | C. | 6,8,10 | D. | 8,10,12 |
14.
如图:AB=DC,要使△ABC≌△DCB,不能添加的条件是( )
| A. | ∠ABC=∠DCB | B. | AC=DB | C. | ∠A=∠D | D. | OC=OB |
8.下列图中∠1和∠2是同位角的是( )

0 284846 284854 284860 284864 284870 284872 284876 284882 284884 284890 284896 284900 284902 284906 284912 284914 284920 284924 284926 284930 284932 284936 284938 284940 284941 284942 284944 284945 284946 284948 284950 284954 284956 284960 284962 284966 284972 284974 284980 284984 284986 284990 284996 285002 285004 285010 285014 285016 285022 285026 285032 285040 366461
| A. | ①、②、③ | B. | ②、③、④ | C. | ③、④、⑤ | D. | ①、②、⑤ |