A:人工管理、文件管理、数据库管理都有其适用的场合
B:文件管理只能通过“资源管理器”来管理
C:人工管理完全可以取代数据库管理
D:数据库管理完全可以取代人工管理
下列行为属于对自己负责任的表现是( )
①用合理、合法的方法,及时纠正自己的过失 ②约定守时
③自尊自信、自立自强 ④只要对自己有利的事就去做
Of all the things we eat and drink,water is the1important.The human body can go2 food for a long time,but two3three days without water could make people4. A lot of people don't understand how5water the human body needs6well and many people don't drink enough,esecially in7weather. Most people drink8they are thirsty but in fact they need more water,expecially when they take9.A man's body is 65 to 75 percent of10. If we don't have enough water. We fell tired and may become ill.
元素代号
X
Y
Z
L
M
Q
原子半径/nm
0.160
0.143
0.102
0.099
0.077
0.074
主要化合价
+2
+3
+6、﹣2
+7、﹣1
+4、4
﹣2