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【多选题】
木材的疵病主要有A.
B.
腐朽
C.
斜纹
D.
虫害
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【简答题】We need to improve the quality of education so that our children will not leave school in literary and reasoning skills. In a society governed by the rule of law, every citizen is subject to possible ...
【单选题】关于CT密度分辨力较高的原因，下列叙述哪项是错误的
A.
成像的X线束到达探测器前，已被准直器严格准直，散射线少，伪影减少
B.
采用了高灵敏度、高效率的接收介质，数据在转换过程中损失小
C.
CT图像为数字影像，可通过调节窗宽、窗位满足各种观察需求
D.
准直器、探测器、数据转换器共同作用，提高了CT图像的密度分辨力
E.
滑环技术的应用，既大大提高了扫描速度，又提高了CT的密度分辨力
【简答题】完形填空 Marc sat next to me when we were in Hill Junior School. He had a serious 1 in communicating with people. One always had to guess what he was saying. 2 , most of my classmates did not like t...
【单选题】关于CT基本概念的描述,下列说法错误的是( )
A.
]CT的硬件设备包括X线发生系统,探测器,扫描机架,扫描检查床,计算机系统。
B.
]准直器的作用是决定扫描层的厚度和像素的大小。
C.
]{CT的“排’指CT探测器在Z轴方向的物理排列数目,为CT的硬件结枸性参数,一般排数越多,探测器宽度越宽,一次扫描完成的宽度越大。}
D.
]CT的“层”指CT数据采集系统同步获得图像的能力,为CT的功能性参数。
【简答题】Today we were organized for a short trip to the West Hill. We set out by the school bus at 7:30 a.m. The weather was pleasure and every one of us was excited. After two hour’s ride, we arrived there...
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