【简答题】有一个名为sampl.mdb数据库。修改职工表“employee”,增加“姓名”字段。其数据类型为文本型,长度为6,并对应职工号添加其姓名,见下表: (2)判断并设置表“employee”的主键,同时将上面增加的“姓名”字段隐藏起来。 (3)设置表“employee”的“基本工资”字段的默认值为:1000。 (4)在当前数据库中,对表“employee”做一个备份,命名为表“tEmp”。 (5)设...
【简答题】This is the cat that killed the rat that ate the cake that lay in the house that Jack built.
【单选题】按照覆盖的地理范围进行分类,计算机网络可以分为( )三类。
【单选题】People in a foreign culture must use gestures______.
D.
Both A and B are correct
【单选题】—How was your weekend? — _________.
【简答题】在食品储藏过程中,食品的化学成分会发生化学变化,以致影响食品的食用价值和营养价值,甚至发生腐败变质。而()是影响食品发生化学反应速度的主要影响因素。
【单选题】When testing a CAT5 cable, the technician notices that pin A is open. However, the cable stillworks fine. Which of the following describes how this is possible?()
A.
The cable was tested for 100Base-TX.
B.
The cable is a 1000BaseT cable.
C.
The switch uses link aggregation,
D.
The switch was setup to use MDIX