设函数f(x)=x2(x-1)(x-2),求f′(x)的零点个数为()。
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According to the author, the following are the function of a junior and community college except ______.
A. it can help you become better equipped to continue education
B. it can help you to learn to face the challenges in life
C. you will learn how to think and learn
D. you will have decision-making classes
专线用户,用户进线侧有保护,在发生内部事故中造成变电站出线开关跳闸,应称为( )。
A. 用户事故
B. 用户影响系统事故
C. 线路停电事故
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 Command1_Click()
B. Command2.Visible=True
Command3.ViSibie=False
D. End Sub
E. Private Sub Command1_Click()
F. Command2.Enabled=True
G. Command3.Enabled=False
H. End Sub
I. Private Sub Command1_Click()
J. Command2.Enabled=True
K. Command3.ViSible=False
L. End Sub
M. Private Sub Command1_Click()
N. Command2.ViSible=True
O. Command3.Enabled=False
P. End Sub
关于贝特类药物调血脂作用叙述不正确的是
A. 显著降低血中VLDL和甘油三酯
B. 与他汀类合用可减少肌病的发生
C. 升高血中HDL
D. 降低血中LDL和胆固醇含量
E. 非调脂作用有助于抗动脉粥样硬化