问题
单项选择题
检修设备与运行中的设备要用（）或眼镜阀可靠切断，打开末端放散管，确保内部煤气吹净。
A.闸阀
B.蝶阀
C.盲板
答案
参考答案：C
搜题请搜索小程序“爱下问搜题”
检修设备与运行中的设备要用（）或眼镜阀可靠切断，打开末端放散管，确保内部煤气吹净。
A.闸阀
B.蝶阀
C.盲板
参考答案：C
| 用所给的介词填空。 | |
2. My father gave a kite ______ me. 3. What did she have ______ lunch? 4. There are lots ______ trees in the park. 5. We watched a football game TV. 6. —Were you ____ home yesterday? —Yes, I was. 7. I've got a letter ______ America. 8. My grandpa worked the field many years ago. |