节流管汇、压井管汇、放喷管线等属于()。
A、井控仪表
B、内防喷工具
C、井控管汇
D、井口装置
参考答案:C
I prefer ________ at home rather than _________ out for a picnic on a rainy day.
A.stay, to go
B.to stay, to go
C.stay, go
D.to stay, go
什么情况下不再享受免息还款期?