当并行接口芯片8255A被设定为方式2时,其工作的I/O口()。A.仅能作输入口使用

题型:单项选择题

问题:

当并行接口芯片8255A被设定为方式2时,其工作的I/O口()。

A.仅能作输入口使用

B.仅能作输出口使用

C.既能作输入口,也能作输出口使用

D.仅能作不带控制信号的输入口或输出口使用

考点:计算机等级考试PC技术计算机三级(PC技术)41
题型:单项选择题

Bob was happy. He was at a new school, and students there were friendly. "Hi, Bob!" some students greeted him, but some students said, "Hi, Peter!" Bob didn't understand. He asked one student. "Why do some students call me Peter?"

"Oh, that's easy to answer," the students said, "Peter was a student here last year. Now he is at a different school. You look like Peter. Some students thought that you were Peter."

Bob wanted to meet Peter. He got Peter's address from a student and went to Peter's house. Peter opened the door. Bob couldn't believe his eyes. He looked really like Peter! Bob and Peter had the same color eyes and same smile. They had the same black hair. They also had the same birthday. And they both were adopted(领养)by two different families.

Bob and Peter found out that they were twin brothers. Soon after the boys were born, one family adopted Bob, and another family adopted Peter. Bob's family never knew about Peter, and Peter's family never knew about Bob.

Soon Bob and Peter's story appeared(出现)in the newspaper. There was a photo of Bob and Peter next to the story. A young man called John saw the photo in the newspaper. John couldn't believe his eyes. He looked like Bob and Peter! He had the same color eyes and the same smile. He had the same black hair. He had the same birthday. And he, too, was adopted by another family.

Later John met Bob and Peter. When Bob and Peter saw John, they couldn't believe their eyes. John looked really like them! Why did John looked really like Bob and Peter? You can guess. Bob and Peter are not twins. Bob, Peter and John are triplets.

小题1:Bob felt_______ at the new school.

A.interested

B.happy

C.sad

D.sorry小题2:Some students in Bob's new school thought_______.

A.John was Peter

B.Bob was John

C.Bob was Peter

D.Peter was John小题3:John knew the story of Bob and Peter from_______.

A.a newspaper

B.a book

C.his classmates

D.his parents小题4:The underlined word "triplets" in last paragraph means"_______".

A.挚友

B.双胞胎

C.三胞胎

D.表兄弟

题型:单项选择题

男患、45岁,诉说3个月前过度弯腰时出现背部有塌下的感觉,以后胸椎中下段棘突区疼痛、围绕躯干向任一侧放射,并于咳嗽或喷嚏时疼痛加重;4天前出现便秘,下腹部与双下肢麻木;入院当日两下肢无力,几乎不能行路,同时有排尿困难。既往史无特殊。查体:双上肢肌力正常、两下肢除股四头肌有微弱收缩外不能移动,双侧肱二、三腱反射(++),双侧膝反射(++++),双侧腹壁反射(-),脐水平可触及膀胱上缘,肛门括约肌松弛,中胸棘突明显叩痛,肋缘下痛觉减退,双侧Babinski征(+)。

根据病史与检查,此患者最可能是()

A.肌病

B.周围神经病

C.神经肌肉接点疾病

D.脊髓病

E.以上均不是

题型:单项选择题

引起流行性脑脊髓膜炎的原因是()

A.麻疹或风疹病毒

B.肺炎球菌

C.脑膜炎双球菌

D.乙型脑炎病毒

E.大肠杆菌感染

题型:单项选择题

立式油罐每()个月对油罐至少进行一次专门性的外部检查,严寒地区在冬季检查每月不少于两次。

A.1

B.2

C.3

D.6

题型:单项选择题

下图表示人体免疫调节中某一过程的示意图,分析并回答下列有关的问题。

图中a细胞的名称为(),b细胞的名称为(),c细胞的名称为(),物质d是()。该过程属于()免疫。

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