水力振荡解堵技术是利用流体流经井下振荡器时产生的周期性缓慢振动，使堵塞物在疲劳应力下从孔道壁上松动脱落。
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You are connected using SQL* Plus to a multitenant container database (CDB) with SYSDBA privilegesand execute the following sequence statements:What is the result of the last SET CONTAINER statement and why is it so?（）
A. It succeeds because the PDB_ADMIN user has the required privileges.
B. It fails because common users are unable to use the SET CONTAINER statement.
C. It fails because local users are unable to use the SET CONTAINER statement.
D. If fails because the SET CONTAINER statement cannot be used with PDB$SEED as the target pluggable database (PDB).
在使用中．天车、游车的（）应尽量一致。
A. 数量
B. 材料
C. 质量
D. 技术规格
小井眼采油技术比常规开采方法成本高。
A. 正确
B. 错误
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