题目内容

用I had done或 I had been doing填空。 When I arrived, everybody was sitting round the table and talking. Their mouths were empty, but their stomachs were full. They ________ (eat).

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用I had done或 I had been doing填空。 The house was very quiet when I got home. Everybody _________ (go) to bed.

用I had done或 I had been doing填空。 We ___________(play)tennis for about half an hour when it started to rain heavily.

用I had done或 I had been doing填空。 When the boys came into the house, their clothes were dirty,their hair was untidy and one of them had a black eye. They _______ (fight).

1、DS18B20适应电压范围更宽，电压范围，在寄生电源方式下可由数据线供电。2、DS18B20的DQ为，DS18B20的GND为；DS18B20的VDD为（在寄生电源接线方式时接地）。3、DS18B20的控制命令，启动DS18B20进行温度转换，读暂存器9字节二进制数字，将数据写入暂存器的TH、TL字节，把暂存器的TH、TL字节写到E2PROM中重新调E2PROM。