芽胞抵抗力强大是因为()
A.具有较厚的多层被膜
B.含水量少
C.具有R质粒
D.结构中有吡啶二羧酸盐
E.通透性低
参考答案:A, B, D, E
Every minute is made full use of _______ our lessons.
A.studying
B.to study
C.study
D.being studied
X线见肿瘤边界不清.骨质破坏,骨结构紊乱的骨瘤多属于()。
A.良性骨肿瘤
B.恶性骨肿瘤
C.附骨瘤
D.骨瘤
E.骨肉瘤