要约过程中存在的法律风险有（）。
A.要约的撤销不当
B.将要约误认为要约邀请
C.要约的撤回不当
D.要约内容不当
参考答案：A, B, C, D
电灯L跟电阻R串联后接到电压为10伏的电源上，电路接通后，100秒内电阻R上电流做的功是10焦．已知电灯L的额定功率是10瓦，电阻R的阻值是10欧，电灯的电阻不变，则电灯的额定电压是______伏．
用所给单词的适当形式填空。
1. The famous (sing) came co the city yesterday.
2. My English teacher likes (tell) jokes.
3.This girl is of medium height, and ( her) has short hair.
4. That is your__ (friend) car. Please look after it．
5. My mother (have)a new look now.
