Perform Quality Control is the process of monitoring and recording results of executing the Quality Plan activities to assess performance and recommend necessary changes.（） are the techniques and tools in performing quality control.

①Statistical sampling

②Run chart

③Control charts

④Critical Path Method

⑤Pareto chart

⑥Cause and effect diagrams

A．①②③④

B．②③④⑤

C．①②③⑤⑥

D．①③④⑤⑥

路试检验机动车制动性能时，应在轮胎与地面间的附着系数不得小于（）的水泥或沥青路面上进行。

A、0.5

B、0.6

C、0.7

D、0.8