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【单选题】
机床主轴要求具有良好的综合力学性能，制造时，用的材料及热处理工艺是( )。A.
20 钢，淬火+高温回火
B.
45 钢，淬火+高温回火
C.
T8 钢，淬火+高温回火
D.
45 钢，正火
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举一反三
【单选题】Let us not waste____________ time we have left. A. the little B. little C. a little D. a little more
A.
the little
B.
little
C.
a little
D.
a little more
【单选题】Lizzie was______ to see her friend off at the airport.
A.
a little more than sad
B.
more than a little sad
C.
sad more than a little
D.
a little more than sad
【单选题】Lizzie was _____ to see her friend offat the airport. [ ]
A.
a little more than sad
B.
more than a little sad
C.
sad more than a little
D.
a little more sad than
【单选题】_______, and problem will be settled.
A.
A bit more effort
B.
making a little more effort
C.
If you make a bit more effort
D.
there being a little more effort
【单选题】Lizzie was______ to see her friend off at the airport.
A.
a little more sad than
B.
more than a little sad
C.
sad more than a little
D.
a little more than sad
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