【简答题】下面关于OD260/OD280比值的应用阐述哪一条是正确的?( ) A DNA样品的OD260/OD280比值大于1.8时,说明样品纯度高; B DNA样品的OD260/OD280比值大于1.8时,说明样品不纯,有蛋白质污染; C RNA样品的OD260/OD280比值大于1.8时,说明样品纯度高; D RNA样品的OD260/OD280比值大于1.8时,说明样品不纯,有蛋白质污染;
【单选题】在一期愈合时,疤痕抗拉力强度达到顶峰的时间大约是:
【简答题】When I was young I loved taking part in high school musicals.I loved to 36 in front of hundreds of people .In one production, I auditioned(试音)like 37 else. My music teacher was 38 that I would get a...
【简答题】如图,OD⊥OA,∠AOB∶∠BOC=1∶3,OD平分∠BOC,则∠AOC= ( )
【简答题】I had a interesting dream last night. I dreamedthat I took part in a race. At first, I could not to run very fast and fell behind. So I didn’t lose heart and keptrunning. All the students on the playg...
【单选题】在一期愈合时,疤痕的抗拉力强度达到顶峰的时间大约是
【单选题】—I will take part in the quiz show next week. —_________.
【简答题】如图,OD⊥OA,∠AOB:∠BOC=1:3,OD平分∠BOC,则∠AOC=( )度.
【单选题】在一期愈合时,疤痕抗拉力强度达到顶峰的时间大约是