与十进制数511等值的十六进制数为( )。
A.1FF
B.2FF
C.1FE
D.2FE
参考答案:A
下列检查结果提示肾衰患者进入尿毒症期的是
A.肾小球滤过率降至50ml/minB.内生肌酐清除率降至30ml/minC.内生肌酐清除率降至20ml/minD.血肌酐达到445μmol/L以上E.血肌酐达到707μmol/L以上
In a certain cache system, the modified cache block is written to main memory only when the block is replaced. All of following are used to describe this policy EXCEPT
A.store-in
B.write-back
C.copy-back
D.write-through