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We can control the reaction process even we cannot measure the parameters of chemical reaction()

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The goal of green chemistry is to treat the environmental pollutions already generated in chemical reactions()

Traditional pollution treatment can provide a permanent cure()

坐骨结节间径7cm,后矢状径7cm,足月分娩应采取何种分娩方式()

A. 剖宫产
B. 产钳术
C. 胎头吸引
D. 会阴侧切
E. 自然分娩

妊娠足月胎儿,下列哪种胎位,不可能经阴道分娩()

A. 臀位
B. 颏前位
C. 颏后位
D. 枕横位
E. 枕后位

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