【单选题】在国际单位制中,磁场强度用H表示,H的单位是安培/米。经常使用的单位叫奥斯特,用Oe表示,它与安培/米的换算关系为:1奥斯特≈( )安培/米。
【简答题】听下面一段材料,回答第1-3题。 1. When did the man buy the T-shirt? A. Yesterday. B. A couple of days ago. C. A few weeks ago. 2. Why does the man want to change the T-shirt? A. He wants a bigger size. B. He doesn’...
【单选题】两个物体间相互作用的力总是同时存在且大小相等,方向相反,沿同一直线,并分别作用在这两个物体上称为()。
【简答题】Carol Kornhaber and her husband don’t have too much financial pressure because ___________. A) they have parents who are rich B) they don’t have children to feed C) they both have a high salary D) the...
【简答题】What does t he word "undoing" in the third paragraph mean?