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更多“About of the dust generated on the longwall comes from the cutting action of the shearer drums”相关的问题
听力原文：W: Oh, there is so much dirt on the floor. I wonder how it got there.
M: Let me get the dust pan and brush. I'll clean it up for you.
Q: What is the man going to do for the woman？
(3)
A．Wash some pans.
B．Clean up the floor.
C．Dust the house.
D．Brush her hair.
A.30%
B.50%
C.70%
D.80%
Which of the following statements about human alveolar macrophage is TRUE？
A．Airborne dust may trigger suppressor macrophage suicides.
B．Airborne dust may trigger stimulatory macrophage suicides.
C．The ratio of suppressor macrophages to stimulatory ones in people with lung diseases is much higher than that in people with healthy lungs.
D．Only stimulatory macrophages show responses to airborne dust.
What does the state-of-the-art computer simulation tell us about？
A．How the Big Bang occurred about 13 billion years ago．
B．How“cosmic dark ages”came into existence．
C．How dust grains and gases were formed after the Big Bang．
D．How the first stars came into being after the Big Bang．
A．remembered she had a dream, but did not remember the specifics
B．thought she should have had a dream, but could not remember what she dreamed
C．had a dream about kettles steaming, chimneys smoking, and dust blowing
D．was upset because someone woke her before she had a chance to dream
A．About 3,000 sensors.
B．About 3,300 sensors.
C．About 5,000 sensors.
D．About 6,600 sensors.
A．It is very serious.
B．It brought a lot of sand and dust to cities and harm people's health.
C．It made visibility in all cities lower to less than 1 meter.
D．It lasted a few days.
What does the state-of-the-art computer simulation tell us about？
A．How the Big Bang occurred about 13 billion years ago．
B．How“cosmic dark ages”came into existence．
C．How dust grains and gases were formed after the Big Bang．
D．How the first stars came into being after the Big Bang．
A．remembered she had a dream, but did not remember the specifics
B．thought she should have had a dream, but could not remember what she dreamed
C．had a dream about kettles steaming, chimneys smoking, and dust blowing
D．was upset because someone woke her before she had a chance to dream
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