- 自动喷水灭火系统的报警阀应进行渗漏试验，试验压力应为额定工作压力的2.0 倍，保压时间不应小于5min。()
- students took part in our school sports meeting last week.
- Could you please tell me ________ in today’s newspaper?—Sorry, _______.
- My brother and 1in Yinchuan since 1997.
- The house ________ in1950.
- The newspaper says if more underground lines next year, it will be much easier for people to travel around Nanjing.
- Could you tell me? — Certainly. In 20 minutes.
- ____ in1943 _____ the harmful smog made its appearance in Los Angeles.[ ]