【判断题】实二次型的标准形不唯一,但是规范形是唯一的.
【判断题】实数域上每一个二次型的规范形都是唯一的。
【单选题】Brian has to get up early to catch the first bus tomorrow. Please .
【单选题】Bob fell asleep in class and the teacher . [ ]
【单选题】Linda asked her mother______ at seven o'clock. [ ]
【单选题】听力原文: The dollar dipped against the euro and the yen on Monday in the wake of weak U. S. jobs data, although the euro remained vulnerable due to worries about the political and economic outlook of the...
A.
both the dollar and the euro were strong
B.
both the dollar and the euro were weak
C.
the dollar was strong while the euro was weak
D.
the dollar was weak while the euro was strong
【判断题】梁上部通长钢筋的搭接位置为跨中净跨的三分之一