2.The key features of the International System are decimalization, a system of prefixes, and a standard defined in terms of an invariable physical measure.
国际制的主要特点是采用了十进制法、字首体系、以不变的物理式解释的标准。
3.In the case of invariable of outrigger belt and changing the vertical positional arrangement, the effect on structural inner force, natural vibration period and sidesway were discussed.
4.In calefactive phase, the electro thermal model of hot bridge wire was established, the calefactive time of invariable current fire case and capacitance discharge fire case were both studied.