______ has the most potential art buyers.
America
B. Hong Kong
C. Japan
D. India
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在肌细胞兴奋-收缩耦联过程中起媒介作用的离子是
A. Na+
B. Cl-
C. K+
D. Ca2+
Max could be best described as ______.
A. lenient and permissive
B. eager to please his students
C. disgusting and loathsome
D. strict and demanding
气体扩散速率与下列哪个因素呈反比
A. 气体分压差
B. 气体扩散面积
C. 气体扩散距离
D. 气体溶解度
治疗下肢急性丹毒，应首选
A. 青霉素
B. 红霉素
C. 庆大霉素
D. 四环素
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