【单选题】In the movie of "Forrest Gump(阿甘正传)", which is right?
A.
Gump(阿甘) becomes very poor in the end
B.
Gump's girlfriend is ill, but recovers in the end
C.
Gump's mother is dead.
【单选题】合理调整轴承间隙,是保证轴承寿命.提高轴承的旋转( )的关键。 A 、 速度 B、 精度 C、 粗糙度
【单选题】如图为生态系统中能量流动图解部分示意图(字母表示能量的多少),下列选项中正确的是( )
B.
生产者与初级消费者之间的能量传递效率为b/a×100%
C.
“草→兔→狼”这一关系中,狼粪便中的能量属于d
【判断题】In computer network, people can share files and documents, printers and scanners,stereos and systems, CD burners and internet connection.
【单选题】如图为生态系统中能量流动图解部分示意图 ( 字母表示能量的多少 ) ,下列选项正确的是 ( )
A.
图中 b = h + c + d + e + f + i
B.
生产者与初级消费者之间的能量传递效率为 ( b / a ) × 100%
C.
“ 草 → 兔 → 狼 ” 这一关系中,狼粪便中的能量属于 d
【多选题】下列关于USP理论的说法正确的有( )。
E.
提出的建议一定是该品牌独具的,是竞争品牌不能提出或不曾提出的
【简答题】在第1题实验中,如果将PC-5所连交换机的接口E0/0/4下的port hybrid pvid 30命令删除,PC-4所连的端口E0/0/3下的port hybrid pvid 10命令删除,其它端口配置保持不变,此时在PC-4与PC-5之间的连通性是否正常?报文经过S1和S2间端口时使用的VLAN TAG是哪个?为什么?
【简答题】Many people are surprised when they find that the Internet was set up in the 1960s. At that time, computers were large and expensive. Computer network didn’t work well. If one computer in the network ...
【单选题】如图为生态系统中能量流动图解部分示意图,1234各代表一定的能量值,下列叙述中错误的是 ( )
A.
生态系统中能量流动具有单向性是因为食物链中生物之间吃与被吃的关系不可逆转
B.
一般情况下,能量在相邻的两个营养级之间的传递效率大约是10%~20%
【单选题】Computer network topology is represented by the geometric relationship between nodes and communication lines in the network.