流回右心房的血液,经右心室压入肺动脉,流经肺部的毛细血管网,再由肺静脉流回左心房

题型:填空题

问题:

流回右心房的血液,经右心室压入肺动脉,流经肺部的毛细血管网,再由肺静脉流回左心房,这一循环途径称为______.

考点:血液循环
题型:填空题

按设备定员,即根据()来计算定员人数。

A.出勤率

B.设备需要开动班次

C.工人看管定额

D.设备需要开动的台数

E.生产任务的数量

题型:填空题

阅读理解。

     A young man couldn't fall asleep at night. He was very worried. One day he went to see a doctor. The

 doctor checked him over carefully. But nothing was wrong with him. The doctor told him to count from

 one to ten again and again at night. "Keep doing this until you fall asleep," the doctor said.

     After a few days, the young man came to the doctor again. But he was surprised that the young man

 was even worse (更糟) than before. "Didn't you count as I told you?" the doctor asked. "Yes, I did," the

  young man answered. "But every time when I reached eight, I couldn't help jumping from the bed." "But

 why?" the doctor asked. The young man said, "I am a boxer (拳击运动员)."

1. The young man had to go to see a doctor because ______.

    A. he couldn't eat anything

    B. he couldn't sleep well at night

    C. he had a bad cold

    D. he liked to see him

2. There was ______ wrong with the young man.

    A. something

    B. anything

    C. nothing

    D. everything

3. The doctor told the young man to ______ every night.

    A. jump

    B. count the numbers

    C. take the medicine

    D. do exercise

4. The young man came to the doctor again because he felt ______ .

    A. even worse

    B. even better

    C. much happier

    D. even sleepier

5. When the man counted from one to eight, he ______.

    A. went to sleep quickly

    B. jumped at once

    C. forgot the other numbers

    D. became a boxer

题型:填空题

已知圆C:x2+y2=4,直线l:x+y=b.

(1)b为何值时直线l和圆相切,并求出切点坐标;

(2)b为何值时直线l和圆相交,并求出弦长.

题型:填空题

以下不属于影响厨房生产管理跨度大小因素的是()

A、层次因素

B、作业形式因素

C、能力因素

D、性别、年龄因素

题型:填空题

当物体从高空下落时,空气阻力随速度的增大而增大,因此经过一段距离后将匀速下落,这个速度称为此物体下落的终极速度.已知球形物体速度不大时所受的空气阻力正比于速度v,且正比于球半径r,即阻力f=krv,k是比例系数,对于常温下的空气,比例系数k=3.4×10-4 Ns/m2,已知水的密度ρ=1.0×103 kg/m3,取重力加速度g=10m/s2,试写出球形雨滴在无风情况下的终极速度表达式vT=______(用字母表示),若半径

r=0.10mm则终极速度vT=______m/s.(结果取两位数字)

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