舒张期正向血流速度最大的是()。
A.颈内动脉
B.颈外动脉
C.颈总动脉
D.锁骨下动脉
E.颈静脉
参考答案:A
The author was required to submit an _____ of about 200 words together with his research paper.[ ]
A. edition
B. editorial
C. article
D. abstract
法制观念的核心在于能用法律来平衡约束自己的行为,在于守法。