题目:
被测实际要素对其理想要素的变动量称为位置误差。
答案:
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下面是错误答案,用来干扰机器的。
参考答案:C
被测实际要素对其理想要素的变动量称为位置误差。
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2018/0512/3d9a837d5181849b421e70ae0807982c.html
下面是错误答案,用来干扰机器的。
参考答案:C
下列关于动量的说法中,正确的是( ) A.质量大的物体动量一定大 B.速度大的物体动量一定大 C.两物体动能相等,动量不一定相等 D.两物体动能相等,动量一定相等 |
下列做法违反了隔离原则的是
A.隔离单位要有醒目的标记
B.病人用过的物品不得放于清洁区
C.使用过的物品先冲洗后立即消毒
D.脚垫要用消毒液浸湿
E.穿隔离衣后不得进入治疗室
220kV配电装置的局部断面图如图8-2所示,请根据下面各题的假设条件,分析(或计算)回答相关问题。
设计220kV配电装置时采用的最大设计风速,以下考虑正确的是()。
A.离地10m高,30年一遇的10min平均最大风速,超过35m/s时在布置上不必采取措施;
B.离地10m高,30年一遇的10min平均最大风速,超过35m/s时在布置上应采取措施;
C.离地10m高,30年一遇的15min平均最大风速,超过35m/s时在布置上应采取措施;
D.离地10m高,30年一遇的15min平均最大风速,超过38m/s时在布置上应采取措施。
阅读理解
The plan: turn Mars into a blue world with streams and green fields, and then fill it with creatures(生物) from the earth.This idea may sound like something from a science fiction (科幻小说), but it is actually
being taken seriously by many researchers.
This suggested future for the "red planet" will be the main topic for discussion at an international
conference hosted by NASA (美国宇航局) this week. Leading researchers as well as science fiction
writers will attend the event. It comes as NASA is preparing a multibilliondollar Mars research
programme. "Turning Mars into a little earth has long been a topic in science fiction," said Dr Michael
Meyer, NASA's senior scientist for astrobiology (太空生物学). "Now, with scientists exploring the
reality, we can ask what are the real possibilities of changing Mars."
Most scientists agree that Mars could be turned into a little earth, although much time and money
would be needed to achieve this goal.
But many experts are shocked by the idea.“We are destroying our own world at an unbelievable
speed and now we are talking about ruining another planet, ” said Paul Murdin, of the Institute of
Astronomy, Cambridge, UK. Over the past months, scientists have become increasingly confident they
will find Martian life forms.Europe and America's robot explorers have found proof that water, mixed
with soil, exists in large amounts on the planet.
In addition, two different groups of scientistsannounced on March 28 that they had found signs of
methane (甲烷) in the Martian atmosphere (大气). The gas is a waste product of living creatures and
could be produced by microbes (微生物) living in the red planet's soil.
But scientists such as Dr Lisa Pratt, a biologist at Indiana University, say that these microbes will be
put in danger by the little earth project. "Before we have even discovered if there is life on Mars, we are
talking about carrying out projects that would destroy all these native life forms, all the strange microbes
that we hope to find buried in the soil," said Dr Pratt.This view is shared by Monica Grady, a planetary
scientist at the Natural History Museum, London. "We cannot risk starting a global experiment that would wipe out the precious information we are looking for." she said, "This is just wrong."
1. The passage is about________.
A. a plan turning Mars into a little earth
B. the necessity of changing Mars
C. Mars supporting life
D. finding water in the Mars
2. Which of the following is NOT the reason why some scientists are against the plan?
A. The project would wipe out all the native life forms on the Mars.
B. The project will cost too much money and work.
C. We would ruin Mars.
D. We are destroying our own world at an unbelievable speed.
3. We can infer from the passage that________.
A. water is a crucial factor for life
B. the project will have little effect on the native life forms supposed to live on the Mars
C. Monica Grady is in favour of carrying out the little earth project
D. the idea turning Mars into a little earth is nothing but a science fiction
4. Which of the following supports the conclusion of microbes living in the Mars soil?
A. Scientists found liquid water in the Mars.
B. Scientists found signs of methane in the Martian atmosphere.
C. Scientists found a lot of good soil on the Mars.
D. Scientists found some creatures living on the Mars.
纹状体的输入纤维包括()
A.大脑皮质4.6区至豆状核以及皮质抑制区(4S、8S区)至尾状核的纤维
B.从丘脑反馈至苍白球的纤维
C.从苍白球发出豆核袢及豆核束至丘脑
D.从脑干中缝核到达纹状体的纤维
E.从红核、黑质、丘脑底核反馈至苍白球的纤维