单项选择题

编码方案一旦使用就不能更改了，若要更改必须将相应档案数据（）后才能更改。 A.
删除 B.
保存 C.
备份 D.
其他

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单项选择题

构件运输时的支承点应与吊点位置在同一什么线上，支承必须牢固
A、竖直线
B、水平线
C、横线
D、纵线

多项选择题

The following statements about the concept of play are correct：

A．A geological unit composed of a set of traps or reservoirs (oil and gas fields) with common petroleum geological origin, including common petroleum migration, reservoir development and accumulation characteristics
B．It is not a geological unit in the strict sense, and its division is based on the geological unit, with due consideration of the needs of exploration and evaluation work
C．Sometimes it also refers to a special purpose exploration work, exploration object and exploration operation
D．In our country, the plays can be divided into units or strata as units