电火花计时器使用的是______（填直流或交流电），其工作电压为______，我国交流电的频率为50Hz，使用这种电源时，每隔______秒打一个点．

根据所给首字母和短文意思完成单词。

A man made a nice talk machine. It could weigh people’s w 小题1:. The man wanted to t 小题2:the machine before he could make a lot of them. He put the machine into the waiting room of a station. There were a lot of people in and out.

The first one who used the machine was an Indian woman. She stood on the machine. The machine thought for a few seconds to d  小题3: which language to speak.

‘Good morning, madam,’ it said in Indian. ‘Your weight is 72kilos. That’s three kilos m  小题4:. If you eat more fruit and v 小题5:, you’ll be soon all right. Please have a nice day.’

The s 小题6:one to use the machine was a Chinese girl. She stood on the machine and waited to h 小题7:her weight. ‘Good morning, Miss,’ the machine said in Chinese, ‘Your weight is 46 kilos. It’s all right for your a 小题8:and height. Go on to eat what you eat every day. Please have a nice day.’

The third one to use the machine was a very f 小题9:American woman. She thought for a long time to stand on the machine. The machine spoke highly in E 小题10:, ‘Good morning. Will one of you get off?’