On New Year's Eve, New York City holds an outdoor () attracts a crowd of a million or more people.
A. incident
B. event
C. case
D. affair
A: What do you plan to do for the next weekeed So far I have no plans at all. B:().
A. Sorry. It is not my business.
B. So do I.
C. I have nothing to say.
D. You could go swimming.
CCK刺激胰液分泌的特点是
A. 水分少,HCO3ˉ和酶含量多
B. 水分和HCO3ˉ含量少,酶含量多
C. 水分和HCO3ˉ含量多,酶含量少
D. 水分多,HCO3ˉ和酶含量少
心肌细胞膜上存在的通道的叙述,正确的是
A. Ito形成内向电流,是钠通道
B. If是钠通道,是内向电流,被Cs+阻断
C. Ik是形成快反应细胞静息电位的主要通道
D. Ik1是起搏细胞4期自动去极化的主要因素