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【单选题】
正常分娩机制转俯胎头遇到阻力以枕额径转为A.
B.
枕额径
C.
枕下前囟径
D.
双肩径
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【单选题】听力原文： Harvard President Lawrence Summers announced a plan today to improve conditions for female scientists at the university. Summers said Harvard would spend fry million dollars over the next ten ye...
A.
Women may not have the aptitude for science and mathematics that men have.
B.
A plan to improve conditions for scientists.
C.
A plan to improve the conditions of the university.
D.
A plan to improve conditions for female scientists.
【简答题】在下图所示电路中,二极管性能理想,试判断电路中的二极管是导通还是截止,并求出 A 、 B 两点之间的电压 U AB 值。
【单选题】A Mediterranean climate is characterized by its hot summers and mild winters.
A.
Y
B.
N
C.
NG
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