This type of apparatus can produce more than 40,000 blood ______ a day.A、example

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问题 This type of apparatus can produce more than 40,000 blood ______ a day.

选项 A、examples
B、models
C、samples
D、specimen

答案 D

解析固定搭配题。specimen意为“试样，标本，待试验物”。example意为“实例，榜样”；model意为“模范，典范，原型”；sample意为“样品”，与其他的在质量、性质和设计上相同。根据题意应选D 。

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