A、有两种比例,对于长试样L<sub>0sub>=8d<sub>0sub>,对于短试样L<sub>0sub>=5d<sub>0sub> B、有两种比例,对于长试样L<sub>0sub>=8d<sub>0sub>,对于短试样L<sub>0sub>=6d<sub>0sub> C、有两种比例,对于长试样L<sub>0sub>=10d<sub>0sub>,对于短试样L<sub>0sub>=6d<sub>0sub> D、有两种比例,对于长试样L<sub>0sub>=10d<sub>0sub>,对于短试样L<sub>0sub>=5d<sub>0sub>
A、r<sub>1sub>=r<sub>2sub>=0,L<sub>1sub>=L<sub>2sub>=M=0 B、r<sub>1sub>=r<sub>2sub>=0,L<sub>1sub>=L<sub>2sub>=M=∞ C、r<sub>1sub>=r<sub>2sub>=∞,L<sub>1sub>=L<sub>2sub>=M=0 D、r<sub>1sub>=r<sub>2sub>=∞,L<sub>1sub>=L<sub>2sub>=M=∞
A、A、B、C;L<sub>1sub>、L<sub>2sub>、L<sub>3sub> B、L<sub>1sub>、L<sub>2sub>、L<sub>3sub>;A、B、C C、U、V、W;L<sub>1sub>、L<sub>2sub>、L<sub>3sub> D、L<sub>1sub>、L<sub>2sub>、L<sub>3sub>;U、V、W