Which position should we spot on the TLC plate? ( )
A、 1-2 cm to the bottom of the plate ;
B、1-2 cm to the top of the plate;
C、 1-2 cm to the left side of the plate;
D、1-2 cm to the right side of the plate
发布时间：2025-07-27 04:02:47
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答案：1-2 cm to the bottom of the plate
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