A:Zn
B:Cu
C:Zn和Cu
D:Cu和Mg
默写填空
读句子,找出错误的一项,并修改 :
Does you like meat?
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函数f(x)=2x+3x的零点所在的一个区间是 ( )
David his friend's invitation to the picnic in order to stay at home and study for the test.