PWM同步更新脉宽的步骤是什么?

题型:问答题 简答题

问题:

PWM同步更新脉宽的步骤是什么?

考点:可编程控制器可编程控制器题库
题型:问答题 简答题
Reading comprehension.
      Not long ago I was invited out to dinner by a girl called Jane. I have met Jane only twice, and she was
very beautiful.
      I was very pleased. "She loves me" I thought. "I am sorry at such short notice." She said when I arrived,
"but we suddenly knew there were going to be thirteen people at the table,so we had to find someone else."
Believing that the number 13 is unlucky is a typical of superstition. Recently I came across a little group of
worried people.They gathered round a man lying on the pavement (人行道)beside a road in London. They
were waiting for an ambulance, for the man had been knocked down by a passing taxi. He had stapped off
the pavement and into the street in order not to walk under a ladder (梯子). To see a black cat in England is
lucky. But if you see a black cat in India, it is considered very unlucky. There, if you are about to set out on
a long journey, and someone sneezes, you should not go. If you break a mirror, you will have seven year's
bad luck. Just superstition, of course.
1. Jane invited the writer out to dinner because ____.
[ ]
A: she liked him
B: she wanted to have twelve people at the table
C: she wanted to marry him
D: she wanted to have fourteen people at the table
2. A man was knocked down by a passing taxi as a result of his ____.
[ ]
A: slow speed
B: bad luck
C: carelessness
D: superstition
3. To walk under a ladder is considered unlucky in ____.
[ ]
A: England
B: India
C: the U.S.A
D: Japan
4. In ____, if someone sneezes when you start on a journey, you might be unlucky.
[ ]
A: England
B: India
C: the U.S.A
D: Japan
5. The writer ____ superstition.
[ ]
A: believes in
B: likes
C: disbelieves in
D: makes others believe in
6. The word "superstition" means ____.
[ ]
A: 迷信
B: 信仰
C: 笃信
D: 敬重
7. The phrase"come across" means ____.
[ ]
A: 来到
B: 遇到
C: 经过
D: 横过
8. The word "ambulance" means ____.
[ ]

A: 公安人员
B: 救治
C: 专用车
D: 救护车

题型:问答题 简答题

男,50岁。右上腹部隐痛2周,食欲缺乏并有呕吐。体检:体温37.6℃,神清,皮肤轻度黄染,腹平,肝肋下1指、质软。可作为黄疸鉴别诊断的实验室检查是()。

A.血清总胆固醇与胆固醇酯

B.血清总胆红素与1分钟胆红素

C.血清白蛋白

D.血清碱性磷酸酶

E.血清淀粉酶

题型:问答题 简答题

进行底物水平磷酸化的反应是()

A.葡萄糖→6-磷酸葡萄糖

B.6-磷酸呆糖→1,6-二磷酸果糖

C.3-磷酸甘油醛→1,3-二磷酸甘油酸

D.琥珀酰CoA→琥珀酸

E.丙酮酸→乙酰CoA

题型:问答题 简答题

一患儿因发热、寒战、呕吐来医院就诊,就诊医师行脑脊液穿刺,将采集的脑脊液送检。

脑脊液涂片革兰染色呈G+小杆菌,通常成双排列,偶可见双球状,无芽孢,无荚膜,在20~25℃形成周鞭毛,有动力,在37℃时动力缓慢或无。符合如上叙述的细菌是()

A.双歧杆菌

B.结核分枝杆菌

C.淋病奈瑟菌

D.产单核细胞李斯特菌

E.福氏志贺菌

题型:问答题 简答题

患者,女性,63岁。晨练中突然头痛,眩晕伴呕吐,步态不稳,查血压170/110mmHg,心率60次/分,双眼向右眼震,右侧指鼻欠稳准,右侧巴宾斯基征阳性。进一步明确诊断的可靠检查依据为()

A.X线

B.脑电图

C.头颅CT

D.脑血管造影

E.血生化检查

更多题库