肾盂内尿酸结石,可表现为()。
A.静脉肾盂造影显示肾盂内充盈缺损
B.血尿
C.两者都有
D.两者都无
E.可有任意一种
参考答案:C
海明校验码是在n个数据位之外增设k个校验位,从而形成一个k+n位的新的码字,使新的码字的码距比较均匀地拉大。n与k的关系是()。
A.
B.
C.n =k
D.n —1 ≤ k
Early in his life, he learned to treasure the work of other people he helped his father do the farming. [ ]
A. where
B. what
C. when
D. whom