Given this method in a class： public String toString（） { StringBuffer buffer = new StringBuffer（）； buffer.append（‟ buffer.append（this.name）； buffer.append（‟>‟）； return buffer.toString（）； } Which is true？（） A: This code is NOT thread-safe. B: The programmer can replace StringBuffer with StringBuilder with no other changes. C: This code will perform well and converting the code to use StringBuilder will not enhance the performance. D: This code will perform poorly. For better performance， the code should be rewritten： return “”；

（） is typically not referred to as a buffer type in critical chain project management． A: Resource buffer B: Free buffer C: Feed buffer D: Project buffer

代码： 以下正确的说法是：（） A: buffer中所有的元素都具有初始值2。 B: buffer[1]、buffer[2]、buffer[3]的初始值是随机的。 C: buffer[1]、buffer[2]、buffer[3]的初始值是确定的，为0。 D: buffer[1]、buffer[2]、buffer[3]的初始值是确定的，但可能随编译器实现而变化。

与LEA AX，BUFFER等价的指令为（ ）。 A: MOV AX，BUFFER B: MOV AX，OFFSET BUFFER C: MOV AX，DS：BUFFER D: AX EQU BUFFER

在执行“LEA BX,BUFFER”指令时,是把( )。 A: BUFFER的内容èBX B: BUFFER的偏移量èBX C: BUFFER的段基值èBX D: BUFFER的内容èEA

Which is the correct description of a pinned buffer in the database buffer cache（） A: The buffer is currently being accessed. B: The buffer is empty and has not been used. C: The contents of the buffer have changed and must be flushed to the disk by the DBWn process.  D: The buffer is a candidate for immediate aging out and its contents are synchronized with the block contents on the disk.

The more the total concentration of a buffer, the more its buffer capacity at 298K.

假设累加器A=556789ABCDh，则指令STH A , -4 , BUFFER执行后BUFFER中的值为 ______ ，指令STL A , 4 , BUFFER执行后BUFFER中的值为______ 。

(4)Buffer capacity does not represent the ability of a buffer to resist changes in pH.

A buffer can only sustain its pH within its buffer capacity.