自律细胞与非自律细胞的区别是
A．1期除极的快慢
B．1期复极的快慢
C．2期复极的快慢
D．3期复极的快慢
E．4期自动除极的有尤
参考答案：E
—I'm sorry I went out for a smoke. I was very tired.
—There's no ______ for this while you are at work. [ ]
A. cause
B. excuse
C. matter
D. choice
急性梗阻性化脓性胆管炎的治疗一般不宜采取
A．胆囊透口术
B．纠正水电解质和酸碱平衡失调
C．胆总管探查取石去除病灶
D．使用有效足量的抗生素
E．及时合理使用多巴胺
