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【单选题】
光圈和景深的关系A.
成正比
B.
成反比
C.
无关
D.
A和B
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皮皮学刷刷变学霸
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【单选题】某患者血红蛋白60g/L，红细胞3.1×10 12 /L，MCV67f1，MCHC30%，属于何种类型贫血（）
A.
大细胞性
B.
正常细胞性
C.
小细胞正常色素性
D.
小细胞低色素性
E.
以上都不是
【单选题】If the problem is not fixed, ______.
A.
the 3 - member crew would have to die
B.
the 5 - member crew would have to die
C.
the 5 - member crew would have to abort the mission
D.
the 3 - member crew would have to abort the mission
【单选题】某患者血红蛋白60g/L，红细胞3.10×10/L，MCV54f1，MCHC30%，属于何种类型的贫血（ ）
A.
大细胞性
B.
正常细胞性
C.
小细胞正常色素性
D.
小细胞低色素性
E.
以上都不是
【单选题】A crew member reports that the high-pressure alarm light of a low-pressure CO2 fixed fire extinguishing system is illuminated．The most probable cause of this condition would be that ______．
A.
an air leak has developed in the tank
B.
the tank cooling system has malfunctioned
C.
the pilot cylinder discharge valve is leaking
D.
an excessive amount of insulation has been installed on the tank and piping
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