Which two statements are true regarding B-tree indexs()
AThe leaf blocks in the index are doubly linked.
BThe leaf node stores a bitmap for each key value.
CThe rows with NULL value in key columns also have entries in the index.
DThe deletion of a row from the table causes a logical deletion in index leaf block and the space becomesavailable for the new leaf entry
Which of the following printers would be the BEST choice for printing on multi-part forms?()
A、Impact printer
B、Thermal printer
C、Inkjet printer
D、Laser printer
Which of the following is the standard aspect ratio for HDTV?()
A、2.35:1
B、4:3
C、1.33:1
D、1.78:1
Which of the following is the correct signal flow for an analog multi-room audio system?()
A、Source,Volume Control,Speaker,Amp
B、Source,Amp,Volume Control,Speaker
C、Amp,Source,Volume Control,Speaker
D、Speaker,Amp,Volume Control,Source
治疗肝硬化肝性脑病的措施是()
A、休息,低盐饮食,限制入水量,补充蛋白质,给予利尿剂
B、休息,高热量高蛋白饮食,保肝治疗
C、休息,高热量限蛋白饮食,输入支链氨基酸
D、休息,禁食,积极补足血容量并采取止血措施
E、休息,控制输液量,纠正电解质紊乱,限制蛋白
CPU中,除了内部总线和必要的寄存器外,主要的两大部件分别是运算器和( )。
A、控制器
B、存储器
C、Cache
D、编辑器