Unless we're all a lot more careful, the people who have died so far will be just the tip of the iceberg.除非我们都加倍小心，否则死者的人数会比现在多得多。In 1981, five members of a climbing party died while scaling Mount Hood.1981 年，一支登山队的...
And shift workers and frequent fliers can develop a circadian rhythm disorder.轮班工人和频繁飞行者会出现睡眠节律障碍.Circadian rhythms show persistent, stable periodicities of about 24 hours.昼夜节律表现出大约24小时的连续而稳定的周期性.upset sb.’s circadian cl...
Hard elastic polypropylene is formed by crystallized under strain and annealing.硬弹性聚丙烯是在应变结晶和热结晶两个复合过程中形成的.The suitable recovery strain annealing temperature was 500 ℃.适宜的回复应变退火温度为500℃.To optimize sub - job assignments, ...