对该病人的护理措施中正确的是()
A. 患肢应抵住床尾
B. 牵引绳不能脱离滑轮的滑槽
C. 患肢和牵引绳上町盖厚被子
D. 嘱病人若皮肤出现水疱,可自行拆除牵引装置
E. 牵引物定时着地一段时间,以免过度牵引
下面是关于Pentium微处理器的段和页的叙述:
①若CRO寄存器中分页控制位PG=0,则对于4GB的存储器空间,至少有4K个 1MB的存储器段可以直接寻址
②若按照段选择子定义,则有16K个232字节的存储器段可以直接寻址
③若CR0寄存器中分页控制位PG=1,则对于4GB的存储器空间,至少有1M个 4KB的存储器页可以直接寻址
④若CR4寄存器中页大小扩展控制位PSE=1,则对于4GB的存储器空间,只有 1K个4MB的存储器页可以直接寻址
上面()叙述是正确的。
A. ①和②
B. ②、③和④
C. ①、③和④
D. ②和③
Who were responsible for the considerable difficulties endured by oil consumers?
A. Saudi Arabia and Kuwait.
B. Libya and Iraq.
C. OPEC
D. Havard economists.
Private cable TV companies could not sustain for long because ______.
A. they failed to obtain the government support
B. they annoyed their customers
C. they had only limited services
D. they did not have licenses