参与哮喘吸入抗原激发的呼吸道炎症反应的主要原发效应细胞是
A．嗜酸粒细胞B．肺泡巨噬细胞C．肥大细胞D．淋巴结细胞
参考答案：A
—Have you seen my pen bought during my visit to Hong Kong Disneyland?
—Oh, Jane must have taken it _________ ; she has the same one as yours.
A．by mistake
B．on purpose
C．by chance
D．by accident
时间数列的指数平滑预测法的关键在于修正常数的取值，时间数列越平稳，其取值越大。()
