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【单选题】
轴向间隙是直接影响 的传动精度。A.
齿轮传动
B.
液化传动
C.
蜗杆副传动
D.
丝杠螺母副
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举一反三
【简答题】It is impossible to estimate the exact number of homeless people because the conditions of homelessness vary.(翻译)
【简答题】There are two spare rooms in the building, __________ has been provided with air-conditioners. A． neither of it B. neither of them C. neither of which D. neither of this
【单选题】The colour of the sky at the horizon depends on ______.
A.
the amount of light
B.
the condition of the atmosphere
C.
the time of the day
D.
the thickness of air
【单选题】According to the passage, the purpose of being weightless was to______.
A.
see what conditions are like in space
B.
prepare the young scientists for future work in space
C.
show the judges of the competition what they could do
D.
make the teams try out their ideas
【单选题】To ________ is to save and protect, to leave what we ourselves enjoy in such good condition thltt others may also share the enjoyment.
A.
conserve
B.
distort
C.
distract
D.
contrive
【单选题】She wants to apply for a ________ in the office of the new government.
A.
position
B.
location
C.
condition
D.
career
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