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洗净后的试管放置晾干的方法是：

A.横放在实验桌上
B.管口向上，直立放在试管架上
C.管口向下，倒放在试管架

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HSC0的预置值设定寄存器是（）。A. SMD42B. BSMD52C. SMD62D. SMD142

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