【单选题】Which of the following is true regarding the action potential of skeletal muscle?
A.
It spreads inward to all parts of the muscle via the T-tubules
B.
It has a prolonged plateau phase
C.
It causes the immediate uptake of Ca2+ into the lateral sacs of the sarcoplasmic reticulum
D.
It is longer than the action potential of cardiac muscle
E.
It is not essential for contraction
【简答题】Translate the following paragraph into Chinese. Nature does not give the crown of its approbation, namely, Beauty, to any action or emblem or actor but to one which combines both these elements; not t...
【单选题】关于风湿热的药物治疗,下列哪项是错误的( )
D.
为肃清链球菌感染病灶,每天注射青霉素一般不少于2周
【单选题】在常用的螺旋传动中,传动效率最高的螺纹是()螺纹。
【单选题】以下关于串的叙述中,哪一条是不正确的? ( )
【单选题】关于风湿热的药物治疗,下列哪项是错误的?( )
A.
为清除链球菌感染病灶,应用青霉素一般不少于2周
【简答题】串是由( )字符组成的序列,一般记为 S =( )
【单选题】广东的戏曲剧种多样,以粤剧、潮剧、( )三种流行最广、影响最大、观众最多。