岩石按成因可分为三大岩类,它们是()。
A. 岩浆岩
B. 沉积岩
C. 变质岩
D. 混合岩
液态光气和异氰酸甲酯等装置要严格控制____混入。
A. 碱液
B. 水
C. 空气
D. 酸液
It is here ______ I first met her.
A. where
B. which
C. when
D. that
His knowledge of French literature is _____ mine.
A.far superior than
B.far superior to
C.more superior to
D.more superior than