Correct the errors in the following letter. Dear Sirs, Steel Concentrates We have received your e-mail d.d Sep. 5th on the above subject. The steel concentrates we have supplied are first rate quality and have high steel content. We don’t understand you
下列有关 DNA Tm值的叙述哪些是正确的: A、与DNA的碱基排列顺序有直接关系 B、与DNA链的长度有关 C、与G-C对的含量成正比 D、G+C/A+T的比值越大,Tm值越高 E、Tm值表示DNA变性后的浓度值 点击查看答案
You helped me to ___ at times when I didn't think I could even go on trying. A.hold back B.hold on C.hold up D.hold off 点击查看答案进入小程序搜题 你可能喜欢 滚动轴承的内圈与基本偏差代号为h的轴径形成( )。 A.间隙配合 B.过渡配合 C.大过盈配合 D.小过盈配合 点击查看答案进入小...
GM/T0021《动态口令密码应用技术规范》动态口令是身份鉴别的唯一算法。 A、正确 B、错误 点击查看答案