A.open；“stop”
B.closed；“stop”
C.open；“start”
D.closed；“start”
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A.pressure
B.temperature
C.viscosity
D.density
A.slow
B.quick
C.arranged
D.high
A.not good
B.good
C.better
D.the best
A.The lower；the worse
B.The higher；the better
C.The lower；the better
D.The highest；the worst
A.slope
B.base
C.top
D.bottom
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