— How much is your house ?
— It's 300,000 yuan. [ ]
A. cost
B. take
C. pay
D. worth
答案:D
以噬菌体为媒介的DNA转移是()
A.转化
B.转导
C.接合
D.原生质体融合
E.转染
固体绝缘材料闪络电压在空气相对湿度低于50%~60%时影响较小,但超过50%~60%时随湿度增加急剧降低()