《国家电网公司电能表质量管控办法》规定，加强“杜绝装表串户”的质量管理，建立安装完毕

椭圆4x²+y²=k（k＞0）两点间最大距离是8，则k=（　　）

A．32

B．16

C．8

D．4

下列有机物互为同分异构体的是  [ ]

①CH₂＝CHCH₃  ② ③CH₃CH₂CH₃ ④HCCCH₃ ⑤CH₃CH＝CHCH₂CH₃

A．①和②   

B．①和③       

C．③和④        

D．⑤和③

男性，40岁。左颞部棒击伤5小时。伤后有短暂昏迷，1小时前再昏迷，左瞳孔散大，右侧偏瘫，病理征阳性。最可能的诊断是（）

A.急性硬膜下血肿伴脑疝

B.急性硬膜外血肿伴脑疝

C.脑挫裂伤伴脑疝

D.原发脑干损伤

E.脑损伤伴脑疝

IP multicasting is a set of technologies that enable efficient delivery of data to many locations on a network. Rather than making multiple copies of a message intended to be distributed to multiple recipients at the (71) of origin of a message, multicasting initially sends just one (72) and does not copy it to the individual recipients until it reaches the closest common point on the network, thereby (73) the bandwidth consumed. Network performance is significantly (74) because it isn’t bogged down with the processing and transmission of several large data fries; each receiving computer doesn’t have to (75) the transmitting server for the file.

A．loop

B．find

C．search

D．query

各项动态检查偏差等级扣分标准：I级每处扣1分，Ⅱ级每处扣5分，Ⅲ级每处扣（）分，Ⅳ级每处扣（）分。