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问题 单项选择题

铅套管使用前，铅套管的内外壁距两端部分均要刮净，其内壁的刮净长度（）mm。

A.10

B.20

C.10～20

D.25

答案

参考答案：D

单项选择题 A1/A2型题

在左侧卧位时腹痛可减轻，这种情况常见于下列哪种疾病（）

A.胃粘膜脱垂

B.胰腺癌

C.急性胆囊炎

D.急性胃炎

E.阑尾炎
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单项选择题

A manufacturing project has a schedule performance index(SPI)of 0.89 and a cost performance index(CPI)of 0.91．Generally，what is the BEST explanation for why this occurred ？（）

A．The scope was change

B．A supplier went out of business and a new one needed to be foun

C．Additional equipment needed to be purchase

D．A critical path activity took longer and needed more labor hours to complet
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