下列哪些是辅助呼吸的方法()
A.间歇加压辅助
B.连续加压辅助
C.压力递增呼吸
D.连续加压呼吸
E.压力递减呼吸
参考答案:A, B, C, D, E
() preparations were being made for the Prime Minister’s official visit to the four universities.
A. Wise
B. Elaborate
C. Optional
D. Neutral
简述门阀士族制度的形成和特点。