【单选题】当消费者订购的商品出现质量或者其他问题时与商家联系，商家会要求消费者提供商品的（）

【单选题】Many companies have a substantial number of computers.

【单选题】当消费者订购的商品出现质量或其他问题时,当与商家联系,商家会要求消费者提供商品的

【单选题】A类地址默认的掩码长度是_______。

【单选题】C类地址默认的掩码长度是________。

【单选题】对椭圆形封头叙述错误的是( )。

【简答题】Salesman: Can I help you? Customer: Yes, I need to buy a computer for this semester. I was told it’s cheaper to buy computers here. Salesman: Well, 1 ( 你听到的是对的 ). You can get 2 ( 很不错的价格 )for a new com...

【单选题】当消费者订购的商品出现质量或者其他问题时，当与商家联系，商家会要求消费者提供商品的（）

【简答题】The computer is a useful machine. It is the most important invention in many years. The oldest kind of computer is the abacus(算盘), used in China centuries ago, but the first large, modern computer was...

【简答题】B. Choose the correct form of the verb to complete these paragraphs. Since computers were first introduced to the public in the early 1980’s, technology (change) 1 a great deal. The first computers (b...