useful load fraction造句

例句与造句

1. For spacecraft the payload fraction is often less than 1 %, while the useful load fraction is perhaps 90 %.
2. When the weight of the payload and fuel are considered together, it is known as the " useful load fraction ".
3. In this case the useful load fraction is not a useful term, because spacecraft typically can't reach orbit without a full fuel load.
4. It's difficult to find useful load fraction in a sentence. 用useful load fraction造句挺难的