She has bought two tickets for the 7:30 show.(Rewrite the sentence, emphasizing the underlined part of a sentence with a cleft sentence(部分强调句).)
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(Rewrite the sentence, emphasizing the underlined part of a sentence with a cleft sentence(部分强调句).)
正常成人膀胱的容积约为
A. 100~200ml
B. 200~300ml
C. 300~500ml
D. 400~600ml
E. 600~800ml
膀胱的最下部为
A. 膀胱尖
B. 膀胱底
C. 膀胱体
D. 膀胱颈
E. 膀胱三角
()膜内浓度高于膜外浓度。
A. 钙离子
B. 氯离子
C. 钠离子
D. 钾离子