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【单选题】
在X线管中，电子撞击阳极靶面的动能，决定于（）
A.
管电流大小
B.
管电压大小
C.
灯丝电压大小
D.
靶物质的性质
E.
以上都不是
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举一反三
【单选题】X线管阳极靶面所用的物质必须具有（）
A.
低原子序数，高熔点
B.
低原子序数，低熔点
C.
高原子序数，高熔点
D.
高原子序数，低熔点
E.
低密度、高比重
【单选题】You want to know where the safest place for young children is in the car? Experts all say the back seat is the safest place for a child of any age. In the back seat, the child is farthest away from th...
A.
how a child-safety seat can protect a child
B.
why the back seat is the safest place in a car
C.
how a child can be kept safe while riding m a car
D.
what causes passengers the most injuries
【单选题】A Frenchman (法国人) once came (来，出现) to London to study. He lived at his friend’s home. He worked very hard (41) his lessons. Every morning, he often (42) reading by the window. His friend, John, liked...
A.
is
B.
said
C.
means
【单选题】下列关于撞击吸收结构的描述中，哪项说法是不正确地？（）
A.
它有效地将撞击能量集中到乘员舱
B.
它有效的分散乘员舱上的撞击能量
C.
它靠吸收撞击能量来降低减速度
D.
前后侧梁上均有能量吸收区域
相关题目：
【单选题】X线管阳极靶面所用的物质必须具有（）
A.
低原子序数，高熔点
B.
低原子序数，低熔点
C.
高原子序数，高熔点
D.
高原子序数，低熔点
E.
低密度、高比重
【单选题】You want to know where the safest place for young children is in the car? Experts all say the back seat is the safest place for a child of any age. In the back seat, the child is farthest away from th...
A.
how a child-safety seat can protect a child
B.
why the back seat is the safest place in a car
C.
how a child can be kept safe while riding m a car
D.
what causes passengers the most injuries
【单选题】A Frenchman (法国人) once came (来，出现) to London to study. He lived at his friend’s home. He worked very hard (41) his lessons. Every morning, he often (42) reading by the window. His friend, John, liked...
A.
is
B.
said
C.
means
【单选题】下列关于撞击吸收结构的描述中，哪项说法是不正确地？（）
A.
它有效地将撞击能量集中到乘员舱
B.
它有效的分散乘员舱上的撞击能量
C.
它靠吸收撞击能量来降低减速度
D.
前后侧梁上均有能量吸收区域
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