挠性
参考答案：
某些矿物在撤除使其发生弯曲形变的外力后，不能恢复原状，这种性质称为挠性。如滑石、绿泥石、蛭石、石墨和辉钼矿等。
In order to improve English _____.
A．Jenny’s father bought her a lot of tapes
B．Jenny bought a lot of tapes for herself
C．a lot of tapes were bought by Jenny
D．a lot of tapes were bought by Jenny’s father
急性扁桃体炎最常见的局部并发症为（）。
A.咽旁脓肿
B.扁桃体周脓肿
C.咽后脓肿
D.颌间脓肿
E.口底蜂窝织炎
