含磷量较少的水样，要用塑料瓶采集。
参考答案：错
解析：要用玻璃瓶采集
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A. Teacher's
B. Teachers
C. Teachers'
_______ you have seen both fighters, ______will win?．
A．Since; do you think who
B．As; who you think
C．When; whoever
D．Since; who do you think
