采购人员请数家厂商提供价格,在对性能、质量等方面比较后,从中选定一家厂商进行采购,称为()。
A.询价现购
B.议价采购
C.比价采购
D.定价采购
参考答案:A
It was lucky that little Jack was not at home when the fire broke out; otherwise, he____his life.
A.had lost
B.would lose
C.would have lost
D.might lose
雌激素的周期性变化恰当的是()
A.排卵后分泌量继续减少
B.随着卵泡发育成熟,雌激素分泌逐渐增多
C.于排卵前分泌量突然减少
D.卵泡开始发育时,雌激素处于中等水平
E.黄体退化时,分泌量急剧上升