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超静定问题：未知量的数目超过了独立平衡方程数目时，未知量不可以稻求出，超出几次未知量，就是几次超静定问题，通常超静定问题需要建立卒睁程，但仍不可解。()A.
正确
B.
错误
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【简答题】The rapid growth of microcomputer systems since the late 1970s has now resulted in BASIC being very likely the most widely used computer language in the world.
【单选题】The plastic bags were first produced in the 1970s and grew increasingly popular since the 1980s.
A.
Y
B.
N
C.
NG
【简答题】The U. S. population of kids (grow) __________ since the 1970s, and will remain at high levels through the 1990s.
【简答题】Since the 1970s, scientists have been searching for ways to connect the brain with computers. Braincomputer intece(BCI) technology could help people with disabilities send commands to machines. Rec...
【单选题】Since the late 1970s, in the face of a severe loss of market share in dozens of industries, manufacturers in the United States have been trying to improve productivity and therefore enhance their inte...
A.
summarizing a thesis
B.
recommending a different approach
C.
comparing points of view
D.
making a series of predictions
【单选题】Since 1970s, there is a tremendous growth in ____________.
A.
manufacturing industry
B.
foreign trade
C.
high-tech industry
D.
the service sector
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