施工质量计划编制完毕，应经( )审核批准，并按施工承包合同的约定提交建设工程监理批准确认后执行。

A．企业技术领导

B．项目技术负责人

C．施工项目经理

D．施工企业负责人

Rapid application development (RAD) systems purport to lighten the developer’s (46) by making it easy to program an application with simple intuitive steps.

RAD tools (47) the developer everything needed to construct a fully functional application quickly and easily. They make short work of modifying the developed product to (48) changes after the program is finished. Applications developed with RAD tools are constructed as they are envisioned. As an application’s real usefulness (49) , the developer armed with RAD tools should be able to (50) on new features with little fuss.

（50）是（）

A.beat

B.change

C.debug

D.tack