按《井下作业井控实施细则》低压井(预测井口关井压力≤35MPa),选择()地面计量设备。
A.一类
B.二类
C.三类
D.四类
参考答案:C
—What’s the weather like today?— . Good luck to you!
A.It’s a fine day
B.Be careful
C.I think so
D.Good idea
预算定额是计价的基础定额。 ( )