天麻、茯苓、厚朴、黄柏都为四川的道地药材。（）
参考答案：错
He was watching TV. _____, his wife was cooking.[ ]
A. while
B. when
C. at the time
D. at the same time
什么是欠硫、过硫？各自会影响制品的哪些性能？
