以下哪种物质属于碱性氮()。
A.吡啶
B.吡咯
C.吲哚
D.咔唑
参考答案:A
—I want to wear some jewelry (珠宝首饰 ) .
—Jewelry? Do you need jewelry? _____? [ ]
A. Why not you wear some flowers
B. Why don't you wear some flowers
C. Why don't wear some flowers
D. How about wear some flowers
所谓中断,是指:()
A.CPU停止工作
B.CPU不再进行原来的工作,而为请求中断的设备服务
C.CPU暂停原来的工作,而为请求中断的设备服务,服务结束后继续原来的工作
D.由请求中断的设备接替CPU的工作