题目内容：
The machines are maintained regularly __________ they don't break down.参考答案：
答案解析：
简答题：The machines are maintained regularly __________ they don't
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- 题目类型：简答题
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On the whole, travelling by train for that distance is _____
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IP地址块211．64．0．0／11的子网掩码可写为（ ）。
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