取一根两头开口的玻璃管，在其下端扎上橡皮膜，管内装10cm深

更新 2022-09-03
科目物理
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难度中等
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挑错有奖

取一根两头开口的玻璃管，在其下端扎上橡皮膜，管内装10 cm深的水，这时橡皮膜向下凸出.接着，把玻璃管慢慢插入盛有酒精的玻璃杯中，当橡皮膜变平时，玻璃管下端插入酒精的深度

A．小于10 cm

B．等于l0 cm

C．大于l0 cm

D．无法确定

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