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【单选题】
下列实验操作导致所读出的数值比真实值小的是（假设其他操作均正确）A.
滴定终点时对滴定管仰视读数：28．80mL
B.
将NaCl固体置于托盘天平右盘称量：砝码（8g）和游码（0．6g）读数的和为8．6g
C.
中和热测定时用铜棒代替环形玻璃搅拌棒搅拌，测定反应的最高温度：30．4 o C
D.
用量筒量取硝酸时，俯视读数：5．8mL
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