题目内容

在一般情况下，人体所能感知的50Hz交流电流可按（）mA考虑。

A. 100
B. 50
C. 10
D. 1.5

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“境界之呈于吾心而见诸外物者，皆须臾之物。”是谁说的？

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基本尺寸相同的、互为结合的孔和轴公差带之间的关系叫配合

A. 正确
B. 错误

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下列关于色甘酸钠预防哮喘发作的机制的叙述，正确的是（）

A. 稳定肥大细胞膜，抑制过敏介质释放
B. 阻止抗原与抗体结合
C. 有较强的抗炎作用
D. 有较强的抗过敏作用
E. 直接松弛支气管平滑肌

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You use Microsoft .NET Framework 4 to create a Windows Forms application. You add a new class named Customer to the application. You select the Customer class to create a new object data source. You add the following components to a Windows Form: A BindingSource component named customerBindingSource that is data-bound to the Customer object data source. A set of TextBox controls to display and edit the Customer object properties. Each TextBox control is data-bound to a property of the customerBindingSource component. An ErrorProvider component named errorProvider that validates the input values for each TextBox control. You need to ensure that the input data for each TextBox control is automatically validated by using the ErrorProvider component. Which two actions should you perform?（）

A. Implement the validation rules inside the Validating event handler of each TextBox control by throwing an exception when the value is invalid.
B. Implement the validation rules inside the TextChanged event handler of each TextBox control by throwing an exception when the value is invalid.
C. Implement the validation rules inside the setter of each property of the Customer class by throwing an exception when the value is invalid.
D. Add the following code segment to the InitializeComponent method of the Windows Form. this.errorProvider.DataSource = this.customerBindingSource;
E. Add the following code segment to the InitializeComponent method of the Windows Form. this.errorProvider.DataSource = this.customerBindingSource.DataSource; this.errorProvider.DataMember = this.customerBindingSource.DataMember

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在一般情况下，人体所能感知的50Hz交流电流可按（）mA考虑。

A. 100 B. 50 C. 10 D. 1.5

“境界之呈于吾心而见诸外物者，皆须臾之物。”是谁说的？

基本尺寸相同的、互为结合的孔和轴公差带之间的关系叫配合

下列关于色甘酸钠预防哮喘发作的机制的叙述，正确的是（）

A. 100
B. 50
C. 10
D. 1.5