涡虫目前被发育生物学和神经系统再生研究广泛选为模式动物,主要是因为:()
A. 涡虫可以在数天内完成身体任何一部分的再生
B. 涡虫体内有大量的成体干细胞(adult stem cells)
C. 涡虫在各种水体环境中均能表现出很好的再生能力
D. 涡虫在各种水体环境都容易采集到
A company needs to connect seven of their Windows-based servers to a DS4000 storage server. The DS4000 only has two host-side connections, and each server has two HBAs. Which of the following is the lowest cost solution to provide no single points of failure?()
A. Implement two 8-port switches design with ISLs
B. Implement two 16-port switches design with ISLs
C. Implement two 8-port switches design without ISLs
D. Implement two 16-port switches design without ISL
()指向旅行社批发商及各有关旅游企业购买产品,出售给旅游者的商业组织或个人。
汽车发动机轴瓦在自由状态下并非正圆,要求轴瓦的曲率半径()轴瓦座孔的半径。
A. 小于
B. 大于
C. 等于
D. 不等于