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【单选题】
p = 3 MPa时水蒸气的饱和温度ts=234°C。当水蒸气压力p =3 MPa,t = 300°C时,水蒸气处于( )状态。A.
过冷水
B.
饱和水
C.
饱和蒸汽
D.
过热蒸汽
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A.
had
B.
found
C.
made
D.
took
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him ___________ four years.
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A.
to help
B.
helped
C.
helping
D.
help
【单选题】Not only his lesson, but also he often help others with their lessons. [ ]
A.
did he do well in
B.
he do well in
C.
does he do well in
D.
he did well in
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【简答题】Our friendship finally broke up mainly because of my fault: I failed to keep in touch with him.
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