单项选择题
A.额部垫高B.采取侧卧式C.采取俯卧式D.保持气道通畅E.随时观察患者情况
A.A park.B.A parking lot.C.A finding place.D.A crowded place.
A.2~4周B.4~6周C.6~8周D.10~12周E.12~14周