目前市场上出售的台式PC机中Pentium 4微处理器的主频一般为A. 0.5GHz

题型:单项选择题

问题:

目前市场上出售的台式PC机中Pentium 4微处理器的主频一般为

A. 0.5GHz左右

B. 1GHz左右

C. 3GHz左右

D. 5GHz左右

考点:计算机等级考试PC技术全国计算机等级考试三级PC技术真题2004年9月
题型:单项选择题

When I was growing up, I was embarrassed to be seen with my father. He (1) severely crippled and very short, and when we would walk together, his hand on my arm (2) balance, people would stare. I would inwardly be afraid (3) squirm at the unwanted attention. If he ever noticed or was bothered, he never let (4) .
It was difficult to coordinate (5) steps - his halting, mine impatient - and because of that, we didn’t say much as we went along. But as we started out, he always said, "You (6) the pace. I will try to adjust to you. "
Our usual walk was to or (7) the subway, which was how he got to (8) . He went to work sick, and (9) nasty weather. He almost never missed a day, and would (10) it to the office even if (11) could not: a matter of pride!
He never talked about himself as an object of pity, (12) did he show any envy of the more fortunate or able. What he looked for in others was a "good heart", and if he found one, the owner was good enough for him.
Now that I am older, I believe that is a proper standard (13) which to judge people, even though I still don’t know precisely (14) a "good heart" is. But I know the times I don’t have one myself.
He has (15) gone many years now, but I think (16) him often. I wonder if he sensed my reluctance to be seen with him during our (17) . If he did, I am (18) I never told him how sorry I was, how unworthy I was, how I regretted it. I think of him when I complain about trifles, when I am (19) of another’s good fortune, when I don’t have a "good heart".
At such times I put my hand on his arm to regain my (20) , and say, "You set the pace, I will try to adjust to you.\

题型:单项选择题

与单细胞藻类相比,草履虫没有的结构是( )                              

①细胞质 ②液泡 ③细胞核 ④细胞壁  ⑤细胞膜 ⑥叶绿体

A.①③⑥

B.②④⑥

C.①④⑤

D.②③⑤

题型:单项选择题

历摘要:患者男,18岁,主诉右侧进行性鼻塞半年,回吸性血涕1月余。今来院就诊,无耳鸣、听力下降、耳胀,无头痛、视矇、复视,无面色苍白、全身乏力。体检:T:36.6℃,P:82次/分,R:20次/分,BP:120/80mmHg。头颅无畸形,双颈未及肿大淋巴结,心肺听诊无异常。双侧鼻腔粘膜光滑,右侧鼻咽见一约1.0cm×1.2cm×1.5cm大小的圆形淡红色肿物,表面光滑,堵塞右侧后鼻孔。为进一步诊治,收入院。

鼻咽纤维血管瘤具有哪些病理特征?()

A.肿瘤多原发于蝶骨及枕骨底部

B.瘤体多无包膜,由大小不一的血窦组成

C.瘤体表面光滑,可呈分叶状,质硬

D.瘤体由胶原纤维及成纤维细胞组成网状基质

E.瘤体的血管壁厚及弹性好

F.根据血管成分和纤维成分优势不同,又可称为纤维血管瘤

G.瘤体根部为正常动脉,有分支伸入瘤体

H.肿瘤具有向邻近组织扩张生长能力

题型:单项选择题

在棉花产区,拔棉杆是农民的一项繁重的体力劳动。王刚同学依照钳子的结构制成一种工具,如图所示,使用时,将小铲着地,用虎口夹住棉杆的下部,然后在套管上用力,棉杆就拔出来了。该农具可视为杠杆,则支点、动点作用点、阻力作用点对应下列位置正确的是 

[ ]

A.转轴一虎口一套管    

B.小铲一虎口一套管

C.小铲一套管一虎口    

D.虎口一转轴一套管

题型:单项选择题

变频器发生过电压故障的原因主要有()。

A.电源电压低于额定电压10%

B.电源电压高于额定电压10%

C.降速过快

D.电源缺相

E.电动机过载

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