绝缘手套按绝缘等级一般分为()。
A.1kV以下和1kV以上两种
B.2kV以下和2kV以上两种
C.0.5kV以下和2kV以上两种
D.不分等级
参考答案:A
The teacher wants his students to know more about modern science and tries hard to develop
a(n) ______ about nature among his students. [ ]
A. curiosity
B. habit
C. interest
D. independence
诊断COPD最重要的检查是()
A.胸部X线检查
B.B超检查
C.胸部CT检查
D.肺功能试验
E.血气分析