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【单选题】
我国将于今年下半年实施神舟七号载人航天飞行任务，实现航天员首次空间出舱活动．飞船在轨道上正常飞行时处于“失重”状态，在这种环境中，以下实验不能像地面上一样正常进行的是______A.
用电子表测时间
B.
用温度计测温度
C.
用平面镜改变光路
D.
用弹簧测力计测物体重力．
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