有一Access数据库“school.accdb” 存放在f:\2015mt\vb文件夹中，其中的“student”数据表用来存储学生的基本情况信息，包括学号(num)、姓名(name)、性别(sex)、分数(score)，括号内的为对应字段名。下列VB程序用来实现根据学号查询并显示学生信息，运行界面如下图所示。在文本框Text1中输入学生的学号，单击“查询”，在文本框Text2、Text3 、Text4中分别显示学生姓名、性别、分数。

Private Sub Command1 Click()

Dim adocn As New adodb.Connection

Dim adors As New adodb.Recordset

Dim str2 As String, str1 As String

str1 = "Provider=Microsoft.ACE.OLEDB.12.0;data source=f:\2015mt\vb\____  "

adocn.Open str1

str2 = "select * from students where num=" + Text1.Text

adors.Open str2, adocn, adOpenDynamic, adLockOptimistic

If adors.EOF = True Then

   MsgBox "你输入的学号不存在"

Else

   Text2.Text = adors.Fields("name").Value

   Text3.Text = adors.Fields("sex").Value

  ____

End If

 adors.Close

adocn.Close

End Sub

（2012•金华）“兰溪白枇杷”（如图）是金华的品牌水果．要获得优质高产的白枇杷，需经过幼苗移栽、嫁接和科学管理等过程．下列是白枇杷种植过程中所采取的措施和原因分析，其中有错误的是（　　）

如图所示，PQ和EF为水平放置的平行金属导轨，间距为L=1.0m，导体棒ab跨放在导轨上，棒的质量为m=20g，棒的中点用细绳经轻滑轮与物体c相连，物体c的质量M=30g．在垂直导轨平面方向存在磁感应强度B=0.2T的匀强磁场，磁场方向竖直向上，重力加速度g取10m/s²．若导轨是粗糙的，且导体棒与导轨间的最大静摩擦力为导体棒ab重力的0.5倍，若要保持物体c静止不动，应该在棒中通入多大的电流？电流的方向如何？

设N_A为阿伏伽德罗常数值，下列说法正确的是（　　）

完型填空

    There are three people in my family, my parents and I. My name is Li Yan. I 'm a middle school1.

    I am thirteen years old. I 'm from China, so I can speak2. I can speak a little English, too. These are my 3 .My father is a teacher in a 4 . He can speak Chinese, English and French. He teaches English. He likes 5. He often goes swimming and plays table tennis on Sunday.

    My6  is a manager. She works in a factory.7only speaks Chinese. She likes music and she can8very well. She often sings old songs. She likes white best, so her favourite season is9because it snows. Look! Here is my 10. Its name is Mimi. It is a very cute cat and I like to play with it.