钢管桅杆常用的立拆方法有：（）。
A、滑移法
B、旋（扳）转法
C、正装（拆）法
D、倒装（拆）法
参考答案：A, B, C, D
Jessica used to ride her bike to school.
A．Jessica is used to go to school by bike.
B．Jessica get used to going to school on her bike.
C．Jessica used to going to school by bike.
D．Jessica used to go to school on her bike.
骨骼组织分布较高的抗生素有（）。
A.红霉素
B.乙基西梭霉素
C.克林霉素
D.头孢哌酮
E.万古霉素
