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【简答题】
在RLC串联的正弦交流电路中,已知电阻R=15Ω,感抗XL=80Ω,XC=60Ω,电阻上电压有效值UR=30V,试求: (1)电流有效值I (2)总电压有效值U (3)总有功功率P (4)总视在功率S (5)电路的功率因数cosφ
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【单选题】一束单色光通过厚度为 1cm 的有色溶液后,强度减弱 20% ,当它通过 5cm 厚的相同溶液后,强度将减弱( )
A.
42%
B.
58%
C.
67%
D.
78%
【单选题】The stable voltage of Zener diode is, D1 6V and D2 8V respectively, as shown in the figure below, what is the output voltage?【图片】
A.
8.7V
B.
6.7V
C.
3V
D.
20V
【多选题】切削热的主要来源有( )
A.
切削变形
B.
切屑与前刀面摩擦
C.
切屑与后刀面摩擦
D.
工件与后刀面摩擦
【简答题】金属切削过程中切削热的来源主要有两个,即()和()
【单选题】For this clipping circuit, what is the minimum output voltage when the diode is conducting?【图片】
A.
- 16.97 V
B.
+ 16.97 V
C.
- 17.97 V
D.
- 1.0 V
【单选题】Each room in this building has its own special __________.
A.
link
B.
links
C.
feature
D.
features
【单选题】______ he can recover soon, I don't mind how much money I have to pay.
A.
So long as
B.
So far as
C.
In case
D.
When
【简答题】Guest: That's fine. Shall I send you a ?(订金) Receptionist: No, you don't have to, you may pay on arrival.A. deposit
【简答题】What is the input and output logic level parameter V IL(max) , V IH(min) , V OL(max) and V OH(min) ?
【单选题】以下删除数据表abc的SQL语句,正确的是(      ) 。
A.
delete abc;
B.
delete table  abc;
C.
drop table  abc;
D.
drop  abc;
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