用多个支撑点同时限制一个自由度，使过定位使工件定位更加稳固。
参考答案：错
1968年法国爆发的“五月风暴”体现了当代高等教育的发展趋势是（）。
A.法治化
B.终身化
C.国际化
D.民主化
"A Pandora’s box" refers to a present or something （）.
A．which brings happiness but looks ugly
B．hich looses a swarm of evils upon mankind
C．which can create anything its owner wants
D．which seems valuable but brings misfortune
