【多选题】外来入侵物种的引入方式包括( )。【2017.10】
【单选题】There are ( ) ways for marketers to conduct business through e-commerce.
【判断题】You have noticed that business marketers build close long-run relationships with customers compared to consumer marketers.
【判断题】The business activities of international marketers are not affected by competition in their domestic market.
【判断题】The push promotion strategy tends to be used by business-to-business marketers.
【单选题】患者,女性,30岁。患有慢性胃溃疡5年。近日胃部疼痛,粪便颜色发黑。医生拟为患者做隐血试验。护士告诉患者3天内禁食的食物有
【判断题】无限长均匀带电直线产生的电场,到直线距离越大,场强大小越小。
【判断题】无限长均匀带电直线产生的电场,到直线距离越大,场强大小越小。
【判断题】无限长均匀带电直线在空间产生的场强大小与到带电直线的距离成反比。
【多选题】呼吸的过程是气体交换的过程,气体交换包括肺换气和组织换气,都是以单纯扩散方式实现的,气体的扩散方向总是( )移动,直至动态平衡