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【单选题】
心内兴奋传导最易发生阻滞的部位是A.
心房肌
B.
房室交界
C.
左右
D.
纤维
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【单选题】In 1995 about 700,000 robots were operating in the industrialized world. Over 500.000 were used in Japan, about 120,000 in Western Europe, and about 12,000 in the United States. Many robot application...
A.
robots can be used in many fields
B.
what jobs robots can do
C.
robots' activities
D.
human being's partner—robots
【单选题】The maximum sea ice cover is about______.
A.
17,000 sq km
B.
170,000 sq km
C.
1,700,000 sq km
D.
17,000,000 sq km
【简答题】A．About 200 miles. B．About 1,000 miles. C．About 7,000 miles. D．About 5,000 miles.
【简答题】A．About 700 million light-years from Sun. B．About 700 million light-years from Earth. C．About 700 million light-years from the black hole. D．About 700 million light-years from a galaxy.
【单选题】According to the article, which of the following is NOT true?
A.
In 1995 about 700,000 robots were operating in the industrialized world.
B.
Why people use the robots is that they are neither dangerous nor unpleasant.
C.
In medical laboratories, robots can be used to handle Potentially dangerous materials, such as blood or urine samples.
D.
In other cases, robots are used in repetitive, unchangeable tasks in which human performance might degrade over time.
【简答题】比较下列各数的c小． 300 000 000______c30 000 000 七07 000 000______7 0七0 000 000 七 700 000 000______七 700 000 000 8 700 000 000______870 000 000 8 七00 000 000______8七万 1亿______99 999 999．
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