She _____ her pen in her room now.
A.finds
B.is finding
C.looks for
D.is looking for
答案:D
解方程.
(1)6.7+3x=8.2
(2)1.8x-9.2=8.8
(3)4.3x-1.8x=97.5.
折光率( )
A.肾上腺素B.尼可刹米C.右旋糖酐40D.维生素EE.罗红霉素
需要测定下列物理常数的药物