病人在下列何种情况下可减弱下腔静脉的搏动（）
A.取交替坐位和站立
B.在深呼气时屏气
C.站立绕行5min
D.做Valsalva动作
参考答案：D
the final round in Shanghai September 30, the television show“The voice of China
raised one billion Yuan in advertisement bidding for its second season.
A．Having finished
B．To finish
C．Having been finished
D．Finishing
受力形式为摩擦端承、端承摩擦桩在灌注混凝土前，沉渣或虚土厚度应≤ ( )。
A．50mm
B．100mm
C．200mm
D．300mm
