心前区疼痛最常见的病因是:
A. 肺心病
B. 冠心病
C. 风心病
D. 高血压病
E. 心肌炎
心源性晕厥最具特征性的表现是 :
A. 短暂意识丧失
B. 头晕
C. 眩晕
D. 休克
E. 黑曚
The key protocol for most of today’s computer networks is ().
A. TCP/IP
B. Windows
C. handshaking
D. FTP
Every device on the Internet has an assigned () such as 128.110.192.40.
A. MAC address
B. Protocol
C. IP address
D. domain name