电气设备正常工作时,其端电压不低于额定电压的90%。
A. 正确
B. 错误
You are creating a Windows application for graphical image processing by using the .NET Framework 3.5. You create an image processing function and a delegate.You plan to invoke the image processing function by using the delegate.You need to ensure that the calling thread meets the following requirements: (1)It is not blocked when the delegate is running (2)It is notified when the delegate is complete What should you do?()
A. Call the Invoke method of the delegate.
B. Call the BeginInvoke and EndInvoke methods of the delegate in the calling thread.
Call the BeginInvoke method by specifying a callback method to be executed when the delegate is complete.Call the EndInvoke method in the callback method.
D. Call the BeginInvoke method by specifying a callback method to be executed when the delegate is complete.Call the EndInvoke method of the delegate in the calling thread.
对于永久性或规模较大、土层较弱的深基坑挡土结构,宜采用()计算水压力。
A. 能反映挡土结构受力动态的弹塑性法和有限元法
B. 三角形分布
C. 梯形分布
通过对增长速度的分析,可以看出某种经济现象增长的快慢程度,它可以分为()。
A. 定比增长速度
B. 环比增长速度
C. 平均增长速度
D. 高速增长速度