窗体文件的扩展名是()。
A..prg
B..frm
C..bmp
D..vbp
参考答案:B
—What should I do next ?
——According to what I said ,________a plan first and then hand it to me
A show off B bring in C draw up D take away
人体安全电压______V,一般通过人体的电流超过6mA时,就会引发触电事故,请估算人体电阻至少应为______KΩ.