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以下关于几种测量紫外吸收的仪器的光径长度l，表述正确的是A.
紫外-可见分光光度计的标准比色皿光径为1.0 cm
B.
使用酶标仪测量紫外吸收时，光径长度与样品体积相关，不是一个固定值
C.
超微量紫外分光光度计 NanoDrop的光径是液滴拉成液柱后液柱的高度
D.
上述三种仪器的光径长度均为标准的1.0 cm
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