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[单选题]
测定某右旋物质,用蒸馏水校正零点为-0.55°,该物质溶液在旋光仪上读数为6.24°,则其旋光度为()
A.–6.79°
B.–5.69°
C.6.79°
D.5.69°
查看答案
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A.–6.79°
B.–5.69°
C.6.79°
D.5.69°
A.锥形瓶用蒸馏水润洗
B.酸式滴定管用蒸馏水洗过后用标准酸液润洗
C.锥形瓶未用碱液润洗
D.酸式滴定管未校正
A.1.2
B.2
C.1.5
D.1.0
A.吸入前嘱病人先漱口
B.用蒸馏水稀释药液在15ml以内
C.氧气流量为6~8L/min
D.嘱病人紧闭嘴唇深吸气,用鼻呼气
E.雾化吸入器进气口接氧气,湿化瓶中加入蒸馏水