在架状硅酸盐矿物的晶体结构中,必须出现的类质同象替代是()
A、Zn2+-Fe2+
B、Mg2+—Fe2+
C、Al3+—Si4+
D、Ca2+—Ba2+
参考答案:C
Sometimes I really wonder how I could make friends with a man who has so little ______ with me.
A.in ordinary
B.in similar
C.the same
D.in common
( ) 缺乏的人体对牛奶会产生不耐受性。
A.乳糖酶
B.磷酸化酶
C.脂肪酶
D.糖原合成酶