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【单选题】
电梯内的人手持一挂有重物的弹簧秤，现弹簧秤的读数突然变大(人始终未动)，请问此时电梯是在做?()A.
电梯此时加速下降
B.
电梯此时匀速上升
C.
电梯此时加速上升
D.
电梯此时减速上升
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