在罗马帝国时代，（）曾是欧洲的政治、经济、文化中心，是西餐烹饪的始祖。 A.英国 B

mdb”数据库中有教师、课程、授课、课程成绩、系别、班级和学生表。
(1)以系别表、班级表和学生表为数据源，创建查询“计算机系学生”，查询计算机系学生信息。结果显示系名称、班级名称和学生姓名。查询结果如图所示。

(2)创建宏“计算机系学生宏”，实现打开“计算机系学生”查询和最小化窗口操作。

信号工区更换轨道电路的各种绝缘时，要求（）配合作业。

睾丸淋巴瘤的声像图特点为（）

A.两侧睾丸受累，内部回声极低

B.两侧睾丸受累，内部回声中等

C.一侧睾丸受累，内部回声中等

D.一侧睾丸受累，内部回声极低

E.两侧附睾受累，内部回声中等

肝风内动四证有何异同？

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