心肌细胞动作电位的去极化期主要与哪种离子跨膜运动有关
A．Na＋B．K＋C．Ca2＋D．Mg2＋E．C1-
参考答案：A
—The twins are quite different. Sam is wild while Tom is quiet.
—Yeah, Sam is ___________ than Tom.
A．less outgoing
B．more outgoing
C．much taller
D．more serious
矿井瓦斯涌出的形式有哪些？
