参与试制工厂的生产前期装配；

Participate in assembly of pre-series in Pilot Plant.

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通常也称围产前期，即分娩前2周的时间。

Often called the early perinatal period, ie 2 weeks before delivery time.

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产前期的病因包括先天畸形、感染以及血管功能不全。

In the prenatal period causes include congenital malformation, infection and vascular insufficiency.

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