2/3 4/7 6/11 8/15_______( ) A: 11/19 B: 10/19 C: 1/2 D: 7/12
2/3 4/7 6/11 8/15_______( ) A: 11/19 B: 10/19 C: 1/2 D: 7/12
下列4组条件中,能判定△ABC∽△DEF的是[ ] [br][/br]A.AB=5,BC=4,∠A=45°;DE=10,EF=8,∠D=45° [br][/br]B.∠A=45°,∠B=55°;∠D=45°,∠F=75° [br][/br]C.BC=4,AC=6,AB=9;DE=18,EF=8,DF=12 [br][/br]D.AB=6,BC=5,∠B=40°;DE=5,EF=4,∠E=40°
下列4组条件中,能判定△ABC∽△DEF的是[ ] [br][/br]A.AB=5,BC=4,∠A=45°;DE=10,EF=8,∠D=45° [br][/br]B.∠A=45°,∠B=55°;∠D=45°,∠F=75° [br][/br]C.BC=4,AC=6,AB=9;DE=18,EF=8,DF=12 [br][/br]D.AB=6,BC=5,∠B=40°;DE=5,EF=4,∠E=40°
3,15,7,12,11,9,15,() A: 6 B: 8 C: 18 D: 19
3,15,7,12,11,9,15,() A: 6 B: 8 C: 18 D: 19
3,15,7,12,11,9,15,() A: 6 B: 8 C: 18 D: 19
3,15,7,12,11,9,15,() A: 6 B: 8 C: 18 D: 19
3,15,7,12,11,9,15,() A: 6 B: 8 C: 18 D: 19
3,15,7,12,11,9,15,() A: 6 B: 8 C: 18 D: 19
3,15,7,12,11,9,15,() A: 6 B: 8 C: 18 D: 19
3,15,7,12,11,9,15,() A: 6 B: 8 C: 18 D: 19
3,15,7,12,11,9,15,() A: 6 B: 8 C: 18 D: 19
3,15,7,12,11,9,15,() A: 6 B: 8 C: 18 D: 19
3,15,7,12,11,9,15,() A: 6 B: 8 C: 18 D: 19
3,15,7,12,11,9,15,() A: 6 B: 8 C: 18 D: 19
3,15,7,12,11,9,15,() A: 6 B: 8 C: 18 D: 19
3,15,7,12,11,9,15,() A: 6 B: 8 C: 18 D: 19
氯化钠和氯化铯晶体中正负粒子的配位数比值分别为() A: 4:4<br/>6:6 B: 6:6<br/>8:8 C: 4:4<br/>8:8 D: 6:6<br/>4:4
氯化钠和氯化铯晶体中正负粒子的配位数比值分别为() A: 4:4<br/>6:6 B: 6:6<br/>8:8 C: 4:4<br/>8:8 D: 6:6<br/>4:4