【单选题】1-甲基-4-异丙基环己烷的反式稳定构型中,甲基和异丙基分别位于哪个键?
【单选题】What is Skeptical observers' opinion on ancestry testing?
A.
It fails to trace distant ancestors.
B.
It rebuilds reliable bloodlines.
C.
It contains fully genetic information.
D.
It fails to achieve the claimed accuracy.
【简答题】假定在使用CSMA/CD协议的10Mb/s以太网中,某个站在发送数据时检测到碰撞,执行退避算法时选择了随机数r=100,试问这个站需要等待()ms后才能再次发送数据?
【简答题】假定在使用CSMA/CD协议的10Mb/s以太网中某个站在发送数据时检测到碰撞,执行退避算法时选择了随机数r=100。试问这个站需要等待多长时间后才能再次发送数据?
【简答题】The greatest achievement of humankind in its long evolution from ancient hominoid ancestors to its present status is the acquisition and accumulation of a vast body of knowledge about itself, the worl...
【判断题】糖尿病一般采用综合治疗法,最根本措施是控制饮食。
【单选题】属于金属材料与无机非金属材料复合的材料是( )