在空间直角坐标系中,点A(-3,1,4)关于原点的对称点的坐标为 [ ]
A.(-3,-1,4)
B.(-3,1,-4)
C.(3,1,4)
D.(3,-1,-4)
答案:D
怎样进行混床体外再生后的树脂混合操作?
_____ made the school proud was _____ more than 90% of the students had been admitted to the key university.
A.What; because
B.What; that
C.That; what
D.That; because