要约的撤回和撤销是不同的。( )
参考答案:对
哪一种改变不能引起继发性椎管狭窄()
A.黄韧带肥厚
B.椎间盘向后膨隆
C.椎间盘后缘骨质增生
D.椎小关节增生
E.强直性脊柱炎
Many political leaders attended the conference and among those present ____ the foreign minister and his wife.
A.were
B.included
C.had
D.remained