下列哪项不属于外部故障成本？（）
A.顾客投诉处理费
B.外审纠正措施费
C.产品售后服务及保修费
D.产品责任费
参考答案：B
The clever boy made a hole in the wall, _____ he could see _____ was going on inside the house. [ ]
A. which; what
B. through which; what
C. through that; what
D. what; that
MIP工艺第一反应区以一次裂化反应为主，采用较高的反应强度，即较高的反应温度和较大的剂油比，裂解较重质的原料油并生产较多的（）。
A、烷烃
B、烯烃
C、环烷烃
D、芳烃
