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[判断题]
Two lines are parallel in space provided that their respective projections on two projection planes are parallel（）
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第2题
A．When there are two lines of plants in each windbreak.B．When there is space left for
A．When there are two lines of plants in each windbreak.
B．When there is space left for some wind to go through.
C．When they are planted around crops.
D．When local green trees are planted in windbreaks.
第3题
Tensile stress is a result of two forces acting in ______.A.opposite directions on the sam
Tensile stress is a result of two forces acting in ______.
A.opposite directions on the same line，tending to pull the material apart
B.opposite directions on the same line，tending to compress the object
C.opposite directions along parallel lines
D.the same direction along parallel lines
第5题
There are two parallel school systems in Britain for primary and secondary education.（
There are two parallel school systems in Britain for primary and secondary education.()
第6题
平行的等总成本线的斜率为PL／PA（PL/PA as the slope of parallel equal-TC lines)
平行的等总成本线的斜率为PL／PA(PL/PA as the slope of parallel equal-TC lines)
第7题
In the figure below, lines a and b are parallel, and lines c and d are parallel.What is th
e measure of？∠x？
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A.95°
B.75°
C.100°
D.105°
E.115°
第10题
A special crossing consists of______.A．the name of a bankB．two parallel transverse linesC．
A special crossing consists of______.
A．the name of a bank
B．two parallel transverse lines
C．the word "not negotiable"
D．all of the above
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