【单选题】为了除去MgCl 2 酸性溶液中的Fe 3+ ,可在加热搅拌的条件下加入一种试剂,这种试剂是( )
【单选题】Pieces of wood _____ into books.
【单选题】Millie ________ her homework just now. But I ______ mine. I shouldn’t watch TV first.
A.
h as finished; haven’t finished
B.
finished; d o n’t finish
C.
finished; haven’t finished
D.
has finished; didn’t finish
【单选题】为了除去MgCl 2 酸性溶液中的Fe 3+ ,可在加热搅拌的情况下加入一种试剂,过滤后,再加入适量的盐酸,这种试剂是( )
【判断题】项目负责人是民事责任的主体,企业可以追究项目负责人的责任。()