舰A在舰B的正东6 km处,舰C在舰B的北偏西30°且与B相距4 km处,它们围捕海洋动物.某时刻A发现动物信号,4秒后B、C同时发现这种信号.A发射麻醉炮弹.设舰
下列哪些生理活动会导致细胞内ADP的含量增加( ) ①小肠绒毛上皮细胞吸收K+和Na+ ②肾小管对葡萄糖的重吸收 ③血液中的氧气进入组织
How to eat healthfully can be especially complex for working women who often have neither the desire nor the time to cook for themselves (or for anyone else). Registered dietitian(营养专家)Barh
将一株生长正常的绿色植物置于密闭的玻璃容器内,在适宜条件下光照培养,随培 养时间的延长,玻璃容器内CO2浓度可出现的变化趋势是 A. 一直降低,
把两块冰相互搓擦,冰会熔化,这表明通过 方式可以改变物体的内能.如果把这两块正在熔化的冰拿到房间,冰不能继续熔化,这表明房间里
When Andrea Peterson landed her first teaching job, she faced the daunting task of creating a music program with almost no money for equipment or supplies in a climate where standards-based learning w
阅读下面短文,掌握其大意, 然后从各题所给的四个选项中,选出最佳选项。 In the United States there was an unusual story telling of the daughter of a mechan
小明在他家的苹果园里,用所学的知识测量苹果的密度,他所能利用的器材有自制的弹簧秤及盛有水的水桶、塑料水瓢、细塑料绳和塑料袋(质量不计)。