多项选择题

（）属于中枢神经系统
A、脊髓
B、脑
C、脾脏
D、肝脏

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单项选择题

灌水率图的修正时,改变灌水定额,灌水定额的调整值不应超过原定额的( ) A.
5% B.
10% C.
15% D.
20%

单项选择题

Which of the following agent is closely associated with carcinoma of the cervix?

A．Apergillus flavus
B．Helicobacter plyori
C．Epstein-Barr virus
D．Human papillomavirus