纤维或纱线在较小拉伸力长时间作用下也会断裂，这种现象我们称为（）。
A、老化
B、疲劳
C、蠕变
D、初始模量
参考答案：B
—Maria is wanted on the telephone. Where is she?
—She ______ the library. You can find her there. [ ]
A. has been to
B. has gone to
C. has left
D. has been in
颅内压增高的临床表现是（）
A.头痛、呕吐、肢体运动障碍
B.头痛、呕吐、视 * * 水肿
C.头痛、呕吐、眩晕
D.头痛、视力下降、视 * * 水肿
E.头痛、呕吐、失眠
