【多选题】Which of the following descriptions about Leizu are correct according to the lecture?
A.
Leizu was also called Xi Ling Shi.
B.
She was believed to be the empress of the Yellow Emperor.
C.
It is said that she had contributed greatly to the invention of sericulture.
D.
She was appointed by Chiyou as the leader in charge of fashioning of the garments.
【简答题】什么是价格歧视?实行价格歧视须具备什么条件?将带来什么结果?
【判断题】当试验地土壤肥力呈南北方向梯度变化时,划分区组应呈东西方向。
【单选题】为了减小温漂,通用型运放的输入级大多采用
【单选题】听力原文:W: Michael, did you go to the lecture on the French Revolution last night? I have never heard such an interesting history lecture before.' M: Yes, wasn't it marvelous! It is said the lecturer is ...