问题
单项选择题
关于CT机X线发生器，错误的描述是
A．高压发生器有连续式和脉冲式
B．对高压的稳定性要求高
C．连续式主要用于第三代CT机
D．采用高精度反馈稳压措施
E．高压值的变化影响X线能量的变化
答案
参考答案：C
解析：连续式主要用于第二代CT机。
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关于CT机X线发生器，错误的描述是
A．高压发生器有连续式和脉冲式
B．对高压的稳定性要求高
C．连续式主要用于第三代CT机
D．采用高精度反馈稳压措施
E．高压值的变化影响X线能量的变化
参考答案：C
解析：连续式主要用于第二代CT机。
| 阅读理解。 | ||||
Here are four kinds of trip for vacation:
| ||||
| 1. What number may you call if you and your friends want to enjoy the sunshine at the seaside? | ||||
[ ] | ||||
| A. 67538293. B. 63986432. C. 64639818. D. 63875629. | ||||
| 2. Sam wants to stay in Hunter Valley with his wife, his five-year-old daughter and his seven-year-old son. How much will it cost? | ||||
[ ] | ||||
| A. $25. B. $50. C. $100. D. $150. | ||||
| 3. David loves sports. He will take his holiday from May 7 to May 15.What activity will he probably join in? | ||||
[ ] | ||||
| A. Hiking in the mountains. B. Fishing in the country. C. Watching plants at night. D. Swimming in the sea. | ||||
| 4. Lucy wants to know something about the life of plants at night. Which trip will she take? | ||||
[ ] | ||||
| A. Trip 1. B. Trip 2. C. Trip 3. D. Trip 4. | ||||
| 5. Which of the following is NOT mentioned (提到) according to four ads? | ||||
[ ] | ||||
| A. The sun hat. B. The warm clothes. C. The umbrella. D. The camera. |