有机磷农药区别于氨基甲酸酯类农药中毒机制是（）。 A.使胆碱酯酶水解 B.与胆碱酯酶

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．dropped

B．proved

C．improved

D．upgraded

基金管理人应当在上半年结束后45日内，在指定报刊上披露半年度报告摘要，在管理人网站上披露半年度报告全文。（）

方向盘式机动车辆换档时，司机两眼应（）。

A.注视变速杆

B.注视前方

C.注视方向盘

（）对人民大众有强烈的凝聚力和精神鼓舞作用，其核心内容构成了当代和未来精神文明的源泉。

A.自然文化遗产资源

B.非物质文化遗产

C.工业遗产资源

D.国家级旅游资源

下列各项不符合收入定义的是______。

A．销售商品的收入
B．提供劳务的收入
C．让渡资产使用权的收入
D．处置固定资产的收入