题目内容
(请给出正确答案)
[单选题]
warrn A. /wo:rn/ B. /wa:rn/ C. /wa:rn/
A.A. /wo:rn/
B.B. /wa:rn/
C.C. /wa:rn/
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A.A. /wo:rn/
B.B. /wa:rn/
C.C. /wa:rn/
A.碱基(RN)
B.阳离子(RNH+)
C.解离常数(pKa)
D.酯链(-CO-)
E.酰胺链(-CNH-)
I ______ to the meeting on time, but I had a flat tire on the way.
A. would be
B. would have been
C. were
D. had been
A.A.So
B.B. Neither
C.C. Nor
试证明:
设fk∈C(Rn)(k=1,2,…),且有
, x∈Rn,
则f(x)的连续点集是Gδ型集:
,Ek(ε)={x∈Rn:|fk(x)-f(x)|≤ε}.
设K(x,y)是Rn×Rn上的可测函数,且有
,a.e.X∈Rn;
,a.e.x∈Rn,
令,试证明Tf∈Lp(Rn),且‖Tf‖p≤C‖f‖p(f∈Lp(Rn).
试证明:
设fk∈L(Rn)(k∈N),,a.e.x∈Rn.若存在F∈L(Rn),使得|f(x)|≤F(x)(x∈Rn),且令
hk(x)=mid{-F(x),fk(x),F(x)}(即取中间之值),则.