RS-232C是 (46) 之间的接口标准，它规定的电平的表示方式为 (47) 。

30456208209的最高位是______，这个数中6表示______．

短文写作。

These days people have realized that it is important to live in harmony(和谐) with nature. Therefore,

they begin to pay much attention to protecting the environment, the wildlife and cultural relics as well

. Can you tell a story in which people tried to protect one of them? Your story can come from your

personal experience or be based on what you read in books or what you watched on TV etc.

要求:

1．短文词数120左右；

2．内容充实,结构完整,语意连贯；

3．书写须清晰、工整

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物品堆放时，放置的方法应有利于移动，放置状况应有利于先进先出，便于查点

邓 * * 理论是当代中国的毛 * * 思想。 ( )

（）平衡相图是各种钢铁热处理的基础。