用玻片法做网织红细胞计数的缺点是（）
A.容易使血液中水分蒸发
B.染色时间较试管法长
C.有时结果偏高
D.重复性较好
E.以上都不对
参考答案：A
解析：网织红细胞计数方法学评价：玻片法容易使混合血液中的水分蒸发，染色时间偏短，因此有时结果偏低；试管法较易掌握，重复性较好，必要时可以从混合血液中再取标本，重新涂片复查，避免再次穿刺给被检查者带来不必要的痛苦。
It was the end of my first day as waitress in a busy New York restaurant.My cap had gone away，and my feet were ____.The loaded plates I carried ____ to be heavier and heavier.Tired and discouraged，I wasn’t able to do anything ____.As I made out a check for a family with several children who had changed their icecream ____ a dozen times，I was ready to stop.Then the father ____ at me as he handed me my tip.“Well done，”he said，“you’ve ____ us really well.” Suddenly my tiredness ____.I smiled back，and later，when the ____ asked me how I’d like my first day，I said，“Fun！” Those few words of praise had ____ everything.Praise is like ____ to the human spirit；we cannot grow without it.And ___，while most of us are only too ____ to apply to others the cold wind of criticism，we are ___ to give our fellows the warm sunshine of praise.Why—when one word of praise can bring such ____？ It is strange how chary(吝啬的) we are about praising.Perhaps it’s ____ few of us know how to accept it.It’s ____ rewarding to give praise in areas in which ___ generally goes unnoticed or unmentioned.An artist gets admired for a glorious picture，a cook for a ____ meal.But do you ever tell your laundry manager how pleased you are when the shirts are ____ just right？In fact，to give praise ____ the giver nothing but a moment’s thought and a moment’s effort.
|