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问题 单项选择题

静脉注射操作中，下述不妥的是()。

A．长期注射者由远端到近端选择血管

B．在穿刺部位上方2cm处扎止血带

C．进针时，针头与皮肤呈20°角

D．在静脉上方或侧方进针

E．拔针后用于棉签按压穿刺点

答案

参考答案：B

解析：[知识点] 静脉注射法

问答题 简答题

简述国债还本资金来源有哪些？
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问答题

In an inversion heterozygote. one of its chromosomes shows the following linkage relationship:


In the homologous chromosome, there exists an inversion in the region


(1)What type of inversion is it
(2)Please draw a synaptic scheme(联会图)of these two chromosomes.
(3)If in the inverted chromosome region there is a lethal gene D at d locus, and in the normal(i.e., without inversion)chromosome there is another lethal gene F at f locus. How much of F1 individuals will be double(both at d and f loci) heterozygote when the inversion heterozygote self-crosses Why
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