软件系统的可维护性评价指标不包括（）。
A．可理解性
B．可测试性
C．可扩展性
D．可修改性
参考答案：C
Since the epidemic appeared last winter, it ______ about a hundred lives. [ ]
A. takes
B. took
C. has taken
D. will take
请简述热靶温度信号自轨边至采集板的信号流程。
