求式中x的值:4x2=16.
系数化为1得:x2=4,
解得:x=±2.
)In the exhibition, all of us felt _________ to see so many _________ things.
A.surprised; amazed
B.surprising; amazing
C.surprising; amazed
D.surprised; amazing
夏季处于生长状态的温室花卉多施()肥。
A.氮
B.磷
C.钾
D.锰