Select the correct answer from eacn arop-uvwirimitu. There are seven lines of reflection across which the regular polygon ABCDEFG can reflect to map onto itself. One of them is a of
The stopwatch shows the time Jeff took to complete a puzzle. Round this time to 1 d.p.
```
Name Time
Abi 3 2. 0 seconds
Abdul 2 4.6 seconds
Omar 3 1. 7 seconds
Jeff
```
□ - □ seconds
一、(本题 10 分) Determine the status of diode is "on" or "off". Use the approximation equivalence ( 0.7 V if "on", and open if "off" for Si diode) to calculate the I and U labeled in the circuit. Fig. a Fig. b
得分 二、 (本题 10 分) Determine the status of diode is "on" or "off". Use the approximation equivalence ( 0.7 V if "on", and open if "off" for Si diode) to calculate the Vo labeled in the circuit.