一、二级

1.
plastic&compact
...悉,还没用到,不过英标会一点.其中截面类型中最好的一二级(plastic&compact)就是承载力最好的.极限状态设计都不了解,还好 …
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Sample Sentence

Definition:
Category:AllAll,OralOral,WrittenWritten,TitleTitle,TechnicalTechnical
Source:AllAll,DictionaryDictionary,WebWeb
Difficulty:AllAll,EasyEasy,MiddleMiddle,HardHard