I'm afraid it ______ rain today.
A:need
B:might
C:can
D:shall
方程x2+y2+x+y﹣m=0表示一个圆,则m的取值范围是( )
Private Sub Label1_Click()
Dim a As Double, b As Single, c As Single
a = Val(Text1.Text)
b = Val(Text2.Text)
c = ( a – b ) / Log(a)
Label1.Caption = Str(c)
End Sub
能运行该段程序的事件过程名是( )
— What did you do last vacation?
— I ______ at home.
用一块湿棉布手帕浸泡在质量分数为70﹪酒精的溶液中,待均匀湿透后取出,将浸透的手帕舒展开,用镊子夹住两角,用火点燃,手帕上的火焰熄灭后,发现手帕完好无损,对这一现象下面的解释正确的是( )