You are the project manager for a manufacturing company involved with making components for Internal Combustion Engines required for the automobile industry. In the past couple of days, there have been too many defects, and you would like to find out whether unusual events are occurring in your manufacturing process whose causes must be identified and corrected. For this purpose, you should use ______ .

A) inspection
B) Pareto charts
C) statistical sampling
D) control charts

.物态变化现象一年四季随处可见，下列说法正确的是   (    )                                         

A．春天的早晨经常出现大雾，这是汽化现象，要吸收热量

B．夏天用干冰给运输中的食品降温，这是应用干冰熔化吸热

C．秋天的早晨花草上出现的小露珠，是液化现象，要吸收热量

D．初冬的早晨地面上会出现白白的一层霜，这是凝华现象,要放出热量