下图所示PKI系统结构中，负责生成和签署数字证书的是（1），负责验证用户身份的是（2

城市规划规定了某宗土地为居住用途，而从该宗土地的位置、周围环境等来看更适合作为商业用途，则可以按商业用途来估价。

阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空，并将答案填写在答卷标号为下列各的相应位置上。

I am now a good student in my class. But you don’t know   小题1:  I started senior English in the beginning, I found it difficult and quite different   小题2: what we learned in junior school.  小题3: _ the help of my teacher, I realized the 小题4: (important) of English, so I was小题5: (determine) to learn English well. From then on, every morning I recited English words,  小题6: (listen) to English tapes and did a lot of  小题7: (exercise). My English teacher,  小题8:  is good at  小题9: (make) her class lively and interesting, is happy to see this.

Now I have made such great progress in my English study that I am  小题10:  (much) interested in learning it than before.

分别在直放站的输入端和输出端测试上下行噪声电平，要求直放站的上行噪声小于（）dBm

A.-30

B.-36

C.-120

发于皮肉之间的急性化脓性疾病，局部红肿热痛，范围6～9cm，应诊断为（）

A.疖

B.有头疽

C.疔

D.附骨疽

E.痈