搜题请搜索小程序“爱下问搜题”
问题
名词解释
回复突变
答案
参考答案：
能抵消已产生的突变效应而使其恢复到野生型的突变。
填空题
一元二次方程3x
2
+2x-5=0的一次项系数是
．
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选择题
American women usually identify their best friend as someone _____ they can talk frequently.
A. who
B. as
C. about which
D. with whom
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