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未知题型

以下地表水的污染源属于面源的是（）

【参考答案】

A、降雨导致的城镇地面径流，未进雨水口而直接进入附近水体的部分
B、某造纸企业将未经处理的废水通过排污暗管偷排至......

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单项选择题
Read the following groups of sentences and rearrange them to form coherent Paragraphs：Paragraph One1. Later on, people began to write on pieces of leather, which were rolled into scrolls.2. In the earliest times, people carved or painted messages on rocks.3. In the middle Ages, heavy paper called parchment was used for writing; books were laboriously copied by hand.4. With the invention of the printing press in the middle of the fifteenth century, the modern printing industry was born.5. Some form of written communication has been used throughout the centuries.
A．1 2 3 5 4
B．2 3 1 5 4
C．5 3 2 1 4
D．5 2 1 3 4
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地表水环境现状调查的方法包括（）
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根据地表水导则，以下哪些水质指标应预留出安全余量？
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