羊水由羊膜表面的胚外中胚层分泌。
参考答案:错
触摸大动脉搏动消失即意味着心脏停搏,据此应予CPR。
After the earthquake, the first thing the local government did was to provide ________ for the
homeless families. [ ]
A. accommodation
B. occupation
C. equipment
D. furniture