静电电压可发生现场放电，产生静电火花，引起火灾，请问静电电压最高可达多少伏？（）
A.50伏
B.220伏
C.数万伏
参考答案：C
________with the help you gave the blind man, mine is not worthy of being mentioned at all.
A．Compare
B．To compare
C．Comparing
D．Compared
人口质量是指人口的身体素质、（）。
