逆流再生固定床中排支管包网,网目为()目。
A.20~30
B.40~60
C.70~80
D.80~100
参考答案:B
80X86CPU可访问的I/O地址空间有______。
A.4GB
B.1MB
C.64KB
D.1KB
The company()when it tried to expand too quickly.
A.has trouble
B.ran into trouble
C.took the trouble
D.ask for trouble