中低压配电网配置的可靠性要求是什么？

如图的装置中，干燥烧瓶内盛有某种气体，烧杯和滴管内盛放某种溶液．挤压滴管的胶头，下列与实验事实不相符的是（　　）

A．CO₂（NaHCO₃）溶液/无色喷泉

B．NH₃（H₂O含酚酞）/红色喷泉

C．H₂S（CuSO₄溶液）/黑色喷泉

D．HCl（AgNO₃溶液）/白色喷泉

短文改错(共10小题；每小题1分，满分10分)

下面短文中有10处语言错误，请在有错误的地方增加、删除或修改某个单词。

增加：在缺词处加一个漏词符号(∧)，并在其下面写上该加的词。

删除：把多余的词用斜线(﹨)划掉。

修改：在错的词下划一横线，并在该词下面写上修改后的词。

注意：1. 每处错误及其修改均仅限一词；

2. 只允许修改10处，多者(从第11处起)不计分。

Last evening, I went to teahouse with my best friend Susan. Before the tea was serving, we talked to each other happily. When the waiter went to us with the tea, we didn’t see him. Unfortunately, Susan rose her hand to comb her hair just while the waiter bent to put the plate on the table. His hand hit the cup, and the tea was spattered (溅) on her trousers. In my surprise, instead of complaining, Susan smiled, “So lucky that it’s not on my shirt, and I can’t even clean it.” Her words were very inspired. We cannot foresee what will happen, but looking at it in a positive way can make us be happy.

软件详细设计产生的图如下：

该图是（）。

A．N-S图

B．PAD图

C．程序流程图

D．E-R图

车床装配调试完毕进行切槽试验，其目的是什么？

下列哪种情况适合采用平均倒凹法确定就位道

A．后牙游离缺失

B．前牙缺失

C．单侧多数牙缺失

D．前、后牙同时缺失

E．缺牙间隙多，倒凹大