7.图中是立方体的展开图,正确的有几个( )
A. | 3个 | B. | 4个 | C. | 5个 | D. | 6个 |
5.一个三角形三个内角度数比是2:3:5,则最大的角为( )
A. | 30° | B. | 50° | C. | 90° | D. | 100° |
4.3:6=9:□,□里的数是( )
A. | 6 | B. | 12 | C. | 18 | D. | 24 |
20.一个比的比值是6.2,后项是0.5,前项是( )
A. | 12.4 | B. | 3.1 | C. | $\frac{5}{62}$ | D. | 6.7 |
19.一根木棒截去全长的$\frac{1}{4}$,正好截去$\frac{1}{4}$米,这根木棒还剩( )米.
0 162535 162543 162549 162553 162559 162561 162565 162571 162573 162579 162585 162589 162591 162595 162601 162603 162609 162613 162615 162619 162621 162625 162627 162629 162630 162631 162633 162634 162635 162637 162639 162643 162645 162649 162651 162655 162661 162663 162669 162673 162675 162679 162685 162691 162693 162699 162703 162705 162711 162715 162721 162729 199269
A. | $\frac{1}{4}$ | B. | $\frac{1}{2}$ | C. | $\frac{3}{4}$ | D. | 1 |