闪烁现象说明（）
A.转移性骨肿瘤病情好转
B.转移性骨肿瘤病情无变化
C.转移性骨肿瘤病情加重
D.转移性骨肿瘤病情复发
E.以上都不是
参考答案：A
串处理指令规定源寄存器使用______，源串在______段中；目的寄存器使用______，目的串必须在______段中。
Compared to normal markets, the existence of fraud and the use of violence in black markets generally leads to:（）
A. poorer economic efficiency.
B. superior economic efficiency.
C. lower profit rates for sellers.
