求助:哪位大侠有做过天然气处理厂放空管系的振动分析? 回复 1# hostage you can use time history in caesar ii. 1. calculate reaction force 2. create force-time profiles 3. build dynamic time history model查看更多
was 和 are 的翻译? 楼上,这里不限制讨论内容是语法还是词汇或是其他,这个区侧重通用英语而已 我认为是汉语和英语的语法习惯问题,中文直接表述没有矛盾,但英文不进行相应的语法或时态改变就语法错误! the seller guarantees that the equipment supplied by the seller under this contract was new. 过去发生的 the seller guarantees that the equipment to be supplied(或being supplied) by the seller under this contract is new. 即将发生的(正在发生的) [ ]查看更多