托福考试

【单选题】The author mention "l.0mm" in line 14 in describing the(a) thickness of a layer of organisms that was deposited on an object(b) diameter of the fibers that were in the guncotton filters(c) thickness of the microscope slides that were used(d) size of the particles that that were collected
网考网参考答案：D
网考网解析：
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