某试样中Cl含量平均值的置信区间为36.45％±0.10％(置信度为90％)，对此结果应理解为
A. 有90％的把握试样中Cl的含量为36.35％
B. 总体平均值µ落在此区间的概率为10％
C. 若再作一次测定，落在此区间的概率为90％
D. 在90％的置信度下，试样中Cl的含量在36.35％～36.55％范围内
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滴定分析法的分析结果相对平均偏差在
A. 0.1﹪以下
B. 2﹪以下
C. 1﹪以上
D. 0.2﹪以下
The tissue foming the impulse-generation and impulse-conduction system of the heart consists primarily of modified
A. motor neurons
B. collagen fibers
C. myelinated axons
D. smooth muscle
E. myocardial fibers
The one tissue listed below that forms a continuum throughout the cardiovascular system is
A. smooth muscle
B. stratified cuboidal epithelium
C. Purkinje fibers
D. simple squamous epithelium
E. cardiac muscle
Purkinje fibers are most obvious in histologic sections of which of the following?
Atrioventricular (AV) node
B. Epicardium of the ventricles
C. Interventricular septum
D. Myocardium of atria
E. Sinoatrial (SA) node
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