问题
单项选择题
为减少辐射剂量，ＣＴ透视时应严格控制：（）
Ａ.曝光时间
Ｂ.球管电压
Ｃ.扫描层厚
Ｄ.扫描视野
Ｅ.球管旋转速度
答案
参考答案：A
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为减少辐射剂量，ＣＴ透视时应严格控制：（）
Ａ.曝光时间
Ｂ.球管电压
Ｃ.扫描层厚
Ｄ.扫描视野
Ｅ.球管旋转速度
参考答案：A
| 完形填空。 Charlie Leng spent a few months saving up (积蓄) seven dollars. He wanted to 1 a model plane and went to the shop with the money. On the way, Charlie 2 a little boy crying on a corner of the street. "_ 3 are you crying?" Charlie asked. "Three big boys _ 4 _ my four dollars just now,"the boy said. "I was 5 to buy some exercise books, but now I can't. " Charlie thought of the 6 dollars in the pocket. He thought of the model plane and the poor _ 7 Charlie wanted to walk away, 8 he did not. 9 he gave four dollars to the boy and went home. Charlie 10_ happy. Do you know the reason? He was happy because the little boy was happy. | ||||
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