润滑油粘度与相对密度成反比,与温度成正比。()

题型:判断题

问题:

润滑油粘度与相对密度成反比,与温度成正比。()

考点:综采维修钳工(高级)综采维修钳工(高级)题库
题型:判断题

下列说法正确的是(  )

A.物体的重心一定在物体上。

B.物体运动的位移大小就是路程。

C.在物理学中,研究问题一般都是先从简单现象着手。

D.在同一地点,物体静止时所受的重力与其运动时所受的重力一样。

题型:判断题

The year 2006 was a busy one for space and technology workers. A planet lost its status and space flights caught the imagination of people around the world.

The following is a short list of the major events of the year:____________

IBM has built a chip that runs about 100 times faster than the ones we have now. The development could lead to faster computers. The chip was first made in June. It can run at a speed of 500 gigahertz (千兆赫).

Pluto loses face  

The International Astronomical Union created the first scientific definition (定义) of the word "planet" in August. Under the new rules, Pluto is no longer called a planet but a "dwarf planet" (矮行星).

Pluto had been considered a planet since its discovery in 1930. For now, there are only the eight "classical" planets in the solar system (太阳系): They are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.

Woman space tourist

The first woman space tourist was launched on a Russian rocket from Kazakhstan on September 18. The flight carried a businesswoman, named Anousheh Ansari, along with a fresh crew for the International Space Station (ISS). Ansari is a 40-year-old American. She has paid at least US$20 million for the trip. She returned on September 28 after her eight-day stay at the International Space Station.

Discovery sent up

The US space shuttle Discovery took seven astronauts on a 12-day repair mission (任务) to the International Space Station on December 9. It was the first night launch by NASA in four years. The last one ended in the failure of the space shuttle Columbia in 2003.

小题1: The sub-title of the second paragraph probably would be _______.

A.IBM

B.The development of computers

C.The first chip born

D.Faster computer chip小题2:The US space shuttle Discovery was sent up mainly to ________.

A.do some research

B.do some repairs

C.be in memory to Columbia shuttle.

D.build a space station.小题3:Which of the following statements is WRONG?

A.Pluto is no longer a real planet according to the new theory.

B.People have been dreaming about space flight.

C.Anousheh Ansari was the first women space tourist.

D.The US space shuttle Discovery is the first one launched by NASA at night.小题4:The passage is written mainly to tell us_______.

A.exciting new science of the year of 2006.

B.space flight full of wonders.

C.the major events of the year of 2006.

D.science and technology is the first productive.

题型:判断题

房间隔缺损根据胚胎发生可分为下列哪几类()

A.卵圆孔型房间隔缺损

B.原发孔型房间隔缺损

C.继发孔型房间隔缺损

D.静脉窦型房间隔缺损

E.冠状静脉窦型房缺

题型:判断题

男,38岁,6缺失,5近远中大面积银汞合金充填物,无松动,X线显示已行完善的根管治疗;7未见明显的牙体牙髓及牙周病变

如果患者要求固定义齿修复,但5牙冠剩余牙体薄弱,最佳的处理措施是()。

A.567烤瓷固定桥

B.4567烤瓷固定桥

C.5行桩核恢复后,567烤瓷固定桥

D.567金属固定桥

E.5行桩核恢复后,567金属固定桥

题型:判断题

可编程序控制器在每个任务执行的过程中,()对中断是不响应的。

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