【单选题】—A number of children ______ standing outside the office when I got there. —The number of the children______ 16. [ ]
【判断题】组元是构成材料的基本单元,这种基本单元可以是元素、化合物或链节。
【单选题】—Could you tell me ________? —By telling them some funny stories. [ ]
A.
when I can visit the children
B.
why the children are not happy
C.
where the children want to go
D.
how I can cheer up the sick children
【判断题】刚体单元和梁单元和板单元组合在一起进行分析是不可以的
【判断题】组成合金的最基本的独立的单元称为组元。组元可以是金属元素、非金属元素和稳定的化合物。