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| service ceiling; ceiling (飞机在规定条件下所能达到的最大飞行高度。有理论升限和实用升限两个概念。理论升限，是飞机能维持等速平飞的最大高度，在此高度上飞机的爬升率为零。实际上飞机达不到这个高度，往往规定飞机的爬升率略大于零的某一定值所对应的高度为实用升限) | |||
| practical ceiling | |||
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| service ceiling | |||
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| S/C service ceiling | |||
| 实用 升限: 3 phrases in 1 subject |
| Technology | 3 |
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