机体新陈代谢和体温调节活动都必须有水的参与才能完成。每日需水量，婴儿______ml

We should let more young parents and their children can enjoy scientific early education.

A．provide more young parents and their children to enjoy early education

B．provide more young parents and their children to enjoy early education and scientific

C．provide young parents and their children enjoy more scientific early education

D．provide young parents and their children with more early education services

沿海地区发展经济的有利的自然条件是[ ]

A、地形和气候适宜农业的发展和居民生活

B、沿海地区人口稠密，城市较多

C、科技，教育，文化比较发达

D、拥有便利的交通

下列哪项不属于上证分类指数（）。

A.工业类指数

B.金融类指数

C.公用事业类指数

D.综合类指数

窗体上添加有3个命令按钮，分别命名为Command1、Command2和Command3。编写Command1的单击事件过程，完成的功能为：当单击按钮Command1时，按钮Command2可用，按钮Command3不可见。以下正确的是( )。

A．Private Sub Commandl_Click()
Command2.Visible=True
Command3.Visible=False
End Sub

B．Private Sub Commandl_Click()
Command2.Enabled=True
Command3.Enabled=False
End Sub

C．PrivateSubCommand1_Click()
Command2.Enabled=True
Command3.Visible=False
End Sub

D．PrivateSubCommand1_Click()
Command2.Visible=True
Command3.Enabled=False
End Sub

铅酸蓄电池的自放电小，25℃下自放电率小于（）。

A.2%

B.3%

C.4%

D.5%