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单项选择题

上颌突开始生长发育
A、 胚胎第三周
B、 胚胎第四周
C、 胚胎第五周
D、 胚胎第六周
E、 胚胎第七周

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相关考题

单项选择题
关于电子邮件说法不正确的是（ ）。 A.
电子邮件促销具有一定的针对性 B.
电子邮件促销是企业常用的促销方式之一 C.
电子邮件促销成本低廉 D.
电子邮件促销无法具备个性化，营销效果差
未知题型
In general, the ancient Romans were practical peoplE.They cared little about philosophy and pure mathematics than do the Greeks. The Romans were the best of the ancient engineers and architects. They were brilliant students of Greek geometry and trigonometry, and they applied their knowledge in the construction of fine bridges, road aqueducts, and public buildings. They used the iron they produced mainly for spears, swords, and shields rather for building construction. Although the Romans accomplished practical wonders, but they did very little theoretical and scientific thinking. Because of their frequent wars, much of their inventions were no more than improvements in the design of Greek weapons to which they were familiar. There are two reasons for the Roman neglect of philosophy and mathematics. First they were too busy conquesting nearby nations.
Secondly, they are handicapped by the rigidity of their numerical system which encouraged the study of pure mathematics.
(11)
未知题型
某外贸公司按CIF价格条件出口一批产品，合同总金额为20000美元，加一成投保平安险、短量险，保险费率分别为0．8％和0．2％，问保险金额和保险费各为多少?
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