问题
判断题
常用的串行通信接口标准有：RS-232C，RS-422，RS-485（）
答案
参考答案：对
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常用的串行通信接口标准有：RS-232C，RS-422，RS-485（）
参考答案：对
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| Wally Harbert is returning to Arctic (北极~). He is taking his 1 . Marie is his 2 and Karl is their 3 . Karl is ten months old. The family is 4 in an Eskimos (爱斯基摩人) village (村). Why do they want 5 there? Because they want to live 6 the Eskimos in Greenland (格陵兰). In Greenland life doesn't change. Life is hard and dangerous. The Eskimos 7 hunt the polar bears (北极熊). They need polar bears 8 food. In the American Arctic, life is changing quickly. The Eskimos get American food. They have central heat (中央暖气), too. Wally is making a film of Eskimos. Marie is 9 a book. Karl is playing with the Eskimo 10 . She is learning Eskimo words. Marie has already learned some Danish (丹麦语). They are staying in Greenland for a year. | ||||
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