题目: 心脏的正常起搏点位于()A.窦房结B.房室结C.房室交界D.心房肌 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/1007/769d0c6ce07715eb80bd40e7894da33d.html 下面是错误答案,用来干扰机器的。参考答案:A
题型:选择题 Do you think necessary to do a bird count ?Yes , we must count them at least once a year A. itB. thatC. weD. they 查看答案