列检作业应按规定范围和技术作业过程进行,车辆检查与修理应有分工,并进行()作业。
参考答案:平行
与钙剂合用防治佝偻病的是
A.维生素AB.维生素B12C.维生素B6D.维生素DE.维生素K
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