原句如下：
Fully tensioned means that the bolt is torqued until a tension force approximately equal to 70% of its tensile strength is produced in the bolt. Snug-tight is the condition that exists when all plies are in contact. It can be attained by a few impacts of an impact wrench or the full effort of a person using an ordinary spud wrench.Common bolts (A307) can be installed only to the snug-tight condition. There is no recognized procedure for tightening these bolts beyond the point.
我的问题如下：
1.首先是关于词汇的理解。fully tensioned是不是国内规范中提的“完全张拉”，snug-tight是不是理解为“贴合拧紧”? 另外, impact wrench/spud wrench该怎么翻译呢？
2.想问一下，是不是fully tensioned的高强螺栓用起来要比snug-tight的高强螺栓要贵呢？
3.什么情况下用fully tensioned,什么情况下用 snug-tight?
4.它们有什么区别呢？还是说螺栓都一样，只是施工方法不一样？
5.能不能给出施工的示意图呢？