问题
填空题
烷基取代苯
可以被KMnO4酸性溶液氧化生成
，但若烷基R中直接与苯环连接的碳原子没有C-H键，则不容易被氧化得到
。现有分子式是C11H16的一烷基取代苯，已知它可以被氧化为
的同分异构体有7种，其中的3种是：
请写出其他的4种结构简式：____、____、____、____。
答案
搜题请搜索小程序“爱下问搜题”
烷基取代苯可以被KMnO4酸性溶液氧化生成，但若烷基R中直接与苯环连接的碳原子没有C-H键，则不容易被氧化得到。现有分子式是C11H16的一烷基取代苯，已知它可以被氧化为 的同分异构体有7种，其中的3种是：
请写出其他的4种结构简式：____、____、____、____。
| A total of 4.6 million digital televisions have been sold, and the sales of HDTV sets have quadrupled since last year. Consumers have bought HDTVs to play their DVDs and to have clearer pictures and wide screens. Only a small percentage of the people who have purchased HDTVs, however, have actually hooked their TVs up to receive high-definition television digital signals. Perhaps television viewers are having trouble keeping up with the changes in technology. Even the manufacturers of HDTVs, like Mitsubishi, Thomson Multimedia, Sony, and Samsung seem to have a tough time learning how to make their sets work with the various digital TV formats because little standardization has been required or implemented in the industry. Some of the HDTVs Weigh over 200 lbs., and a variety of retailers offer a delivery service to the buyer’s home to help install the heavy sets. This is known as a white-glove service and usually comes with an extra fee. After HDTV purchasers get their sets home and hook them up, they will still need to Work to get the digital signals to their systems. Most of the industry’s cable providers do not yet offer high-definition programing, and only about 15% of commercial television stations have switched over to even the lowest improved digital pictures. Worse yet, viewers may need to install antenna before they can even get the digital signals to their new HDTV sets. Another frustration for home-theater seekers is that the current HDTV sets allow owners only to watch high-definition programs, not to record them. |
"Hook up" as in "hooked their TVs up" underlined in Paragraph 1. most probably means to______.
A．have a hood over the TV
B．be connected to
C．relate oneself to
D．keep contact with