Carefully fill two sampling bottles completely with stream water. Use the dissolved oxygen meter to measure dissolved oxygen in the water.
小心地把两个取样瓶以溪水完全装满。以溶氧量计测量水中的溶解氧量。
Carefully fill two sampling bottles completely with stream water. Use the dissolved oxygen meter to measure dissolved oxygen in the water.
小心地把两个取样瓶以溪水完全装满。以溶氧量计测量水中的溶解氧量。
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