对热处理炉，选用的耐火材料对炉内气氛的影响是（）。
A.必须考虑的
B.无所谓的
C.不可避免的
D.微不足道的
参考答案：A
综合填空。
用适当的词完成句子，使短文意思完整。
There are 47 different kinds of Kangaroos (袋鼠). The smallest are about a quarter of a meter long. The
1. _____ are taller than a man. Kangaroos have very long strong back 2. _____. These are used for 3._____ .
They also have 4. _____ strong tails for resting on.
Kangaroos' front legs are 5 ._____shorter, and are almost like arms. Kangaroos'
虚拟存储技术的实现是基于( )。
A．程序可再现原
B．程序执行的局部性原理
C．进程同步互斥原
D．存储器分页分段管理技术
