Which of the following is true
As long as algae produces enough oxygen on Venus, people can land there.
B. To live on Venus is the only way to ensure the survival of human race.
C. Venus is possibly very similar to the earth both in size and mass.
D. Life on Venus will be pleasant at first.
生石灰的原料是( )。
A. CaO
B. CaCO3
CaC2
D. Ca(O2
混凝土用混凝土泵输送时，最小水泥用量为( )。
A. 250kg/m3
B. 286kg/m3
C. 300kg/m3
D. 350kg/m3
工程中有2个窗体,名称分别为Form1、Form2,Form1为启动窗体,该窗体上有命令按钮Command1。 要求程序运行后单击该命令按钮时显示Form2,则按钮的Click事件过程应该是【 】
A. Private Sub Command1_Click() Form2.Show End Sub
B. Private Sub Commaad1 Click() Form2.Visible End Sub
C. Private Sub Command1_Click() Load Form2 End Sub
D. Private Sub Command1 Click() Form2 Load End Sub
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