【单选题】A report last week showed that almost half of all men failed to take up their offering of two weeks paternity leave(陪产假). The Equality and Human Rights Commission,【C1】______carried out the research, f...
【判断题】接近开关除了用于限位保护和行程控制外,还可用于检测物体的存在、高速计数、测速、液位控制、定位、变换运动方向、检测零件尺寸及用作无触头按钮等。
【单选题】关于宇宙环境保护的叙述,正确的是 [ ]
A.
宇宙环境保护主要是指保护宇宙间天体位置的稳定
B.
宇宙是无边无际的,因此宇宙间的垃圾并不会构成威胁
C.
宇宙垃圾与航天器的相对速度很大,一旦相遇,会给航天器造成重大损坏
D.
目前已开始研究限制产生并清除空间垃圾的办法,因此太空垃圾是完全可以避免
【简答题】Ed Jocelyn and Andy McEwen might have appeared to be a bit mad---the two set off on their own “Long March” through the remotest regions of China on October 16. The idea was to take a year to retrace o...