问题
单项选择题
胸部高千伏摄影，常用滤线栅的栅比为
A．6:1
B．8:1
C．10:1
D．12:1
E．16:1
答案
参考答案：D
解析：高千伏摄影，散射线较多，需选闹高栅比的滤线栅。胸部高千伏摄影的管电压为120kV，常用滤线栅的栅比为12:1。
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胸部高千伏摄影，常用滤线栅的栅比为
A．6:1
B．8:1
C．10:1
D．12:1
E．16:1
参考答案：D
解析：高千伏摄影，散射线较多，需选闹高栅比的滤线栅。胸部高千伏摄影的管电压为120kV，常用滤线栅的栅比为12:1。
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| Mike Green is a bus driver(公交司机). He is in the USA. Mike is his first name. Green is his family name. This is his ID card. Its number is six - zero - three - mne -seven - two - mne. He works in an American bus company(公司).His telephone number is 212 -3478. His mobile phone(手机)number is 21237577689. Look! This is hisjacket. It's red. He likes red very much.  | ||||||||||||
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