甲烷传感器等采用载体催化原理的甲烷检测设备，每半月用空气样和校准气样调校一次，并如实填写《甲烷传感器调校记录》。
参考答案：错
单词拼写
1.What's your______(态度)to solving the problem?
2. Your early reply will be highly ________(感激).
3. She was late and I __________ (同样地) was delayed.
4. They heard the sound of a car ________(接近).
5. He lay on the ground,________(疲惫不堪).
成熟B细胞的表面标记是
A．CD3B．CD4C．CD8D．CDl9E．CD45
