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【单选题】
含水率为 5%的砂220g,其干燥后的重量是( )gA.
209
B.
209.52
C.
210
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举一反三
【简答题】Your duty now is______ (study)．
【简答题】线性方程组有解当且仅当它的系数矩阵的秩与增广矩阵的秩 .
【简答题】Is your son showing his friends the photos now? (用often代替now) _______________________________________________________?
【单选题】I turned over the chinese vase by accident while I cleaned the desk and now it is _________.
A.
in turn
B.
in pieces
C.
in ruins
D.
in trouble
【单选题】We have been on duty for four hours and ____. [ ]
A.
now comes your tum
B.
now does your tum come
C.
now your tum comes
D.
comes now your turn
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