问题
单项选择题
X线管的真空度应保持在
A．133.3×10-5Pa
B．1333×10-2Pa
C．133.3×10-3Pa
D．133.3×10-4Pa
E．133.3×10-5Pa
答案
参考答案：E
解析：X线管的真空度应保持在 133.3×10-6Pa。装入管内的所有部件都必须经过严格清洗和彻底除气。
搜题请搜索小程序“爱下问搜题”
X线管的真空度应保持在
A．133.3×10-5Pa
B．1333×10-2Pa
C．133.3×10-3Pa
D．133.3×10-4Pa
E．133.3×10-5Pa
参考答案：E
解析：X线管的真空度应保持在 133.3×10-6Pa。装入管内的所有部件都必须经过严格清洗和彻底除气。
| 根据句意，选用方框内所给单词的适当形式填空。 | |
2. He is going to ______ at No.1 Middle School this year. 3. Rick and Tom want to be _______ and fly airplanes. 4. They _______ to the nearest town for shopping tomorrow. 5. If she _______ now, she will be able to buy a car soon. |