颊部的血液供应十分丰富,主要来源于()
A.颌外动脉,面横动脉,眶下动脉
B.上唇动脉
C.下唇动脉
D.眶上动脉
E.面动脉
参考答案:A
After the new technique was applied to production, the factory has produced ______ over the same period last year.
A.many cars twice as
B.twice as many as cars
C.twice cars as many as
D.twice as many cars as
山区地方性甲状腺肿患病率高,饮水中碘含量低;而平原地方性甲状腺肿患病率低,饮水中碘含量高,由此推断,饮水缺碘与地方性甲状腺肿有关。这种病因推断方法属于:()。
A、求同法
B、求异法
C、共变法
D、类推法
E、以上都不是