题目内容
(请给出正确答案)
[判断题]
RNAIntegrityNumber(RIN)值大小即反映样品完整性情况,数值越接近10表明样品完整性越高,反之RIN值越小完整性越差(特殊样品需结合基线综合评估)()
答案
是
如果结果不匹配,请 联系老师 获取答案
是
A.32.5,32.5R。42.5,42.5R。52.5,52.5R
B.42.5,42.5R。52.5,52.5R。62.5,62.5R
C.27.5,27.5R。32.5,32.5R。42.5,42.5R
A.rÍmρ(r)
B.mρ(r)Ír
C.r=mρ(r)
D.r≠mρ(r)
A.325,325R,425,425R,525,252R
B.32.5,32.5R,42.5,42.5R,5.25,52.5R
C.325,325R,42.5,42.5R,525,525R
设 R为实数集,映射σ、 满足σ:R→R,σ(x)=x2+2x+1,τ:R→R,r(x)=x/2.
(1)求τ○σ,σ○τ.
(2)对于τ、σ中的双射函数求反函数.
不同烃类化合物在同一催化剂上单独加氢时,其反应速率快慢()。
A.r二烯烃>r炔烃>r烯烃>r芳烃
B.r芳烃>r二烯烃>r烯烃>r炔烃
C.r炔烃>r烯烃>r二烯烃>r芳烃
D.r炔烃>r二烯烃>r烯烃>r芳烃
A.πA,D(σC=D(R×S))
B.πA,R.D(σR.C=S.D(R×S))
C.πA,R.D(σS.C=R.D(R×S))
D.πR,A,R.D(σS.C=S.D(R×S))