你可能感兴趣的试题
It is very expensive to build a wind tunnel. Wind tunnels are very essential in testing planes. Scientists still have a lot to learn about wind tunnels. There are new ways to feed air to the test section.
building to be built to have built to have been built
they are used for large planes they can produce a stronger wind they are built to conduct a high-speed test the air in them flows at a lower speed
connect; to connected; with connects; to connecting; with
to build to be built to have built to have been built
to build to be built to have built to have been built
they are used for large planes they can produce a stronger wind they are built to conduct a high-speed test the air in them flows at a lower speed
shouldn't have found needn't have found wouldn't have found couldn't have found
It is very expensive to build a wind tunnel. Wind tunnels are very essential in testing planes. Scientists still have a lot to learn about wind tunnels. There are new ways to feed air to the test section.
building having built to have built built
in search of in place of for lack of for fear of
in search of in place of for lack of for fear of
湘公网安备 43130202000226号