设正方形零件边长为T,其等效圆ER为()
A: 1T
B: 1.1T
C: 1.25T
D: 1.5T
E: 2.3T
A: 1T
B: 1.1T
C: 1.25T
D: 1.5T
E: 2.3T
举一反三
- 已调波u(t)=Umcos(ωc+Aω1t)t,则其Δω(t)表达式为() A: Aωt B: Aωt C: 2Aωt D: Aωt
- 由555构成的单稳态触发器,其输出脉冲宽度T为:()[img=460x393]1803c4624431c94.png[/img] A: T=1.3RACt B: T=1.5 RACt C: T=0.9 RACt D: T=1.1 RACt
- 由555构成的单稳态触发器,其输出脉冲宽度T为:()[img=460x393]1803c45f406226e.png[/img] A: T=1.3RACt B: T=1.5 RACt C: T=0.9 RACt D: T=1.1 RACt
- 由555构成的单稳态触发器,其输出脉冲宽度T为:()[img=460x393]17de85b34cc48f7.png[/img] A: T=1.3RACt B: T=1.5 RACt C: T=0.9 RACt D: T=1.1 RACt
- 由555构成的单稳态触发器,其输出脉冲宽度T为:()[img=460x393]18039e89f94236a.png[/img] A: T=1.3RACt B: T=1.5 RACt C: T=0.9 RACt D: T=1.1 RACt