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【单选题】
混合气体中含有112 g N2 、80 g O2 和 44 g CO2 ,若总压力为 100 kPa ,则氧的分压为(原子量:N 14,O 16,C 12)A.
13 kPa
B.
33 kPa
C.
36 kPa
D.
50 kPa
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【单选题】---Where is Lucy?---She's not here now. She ____ to the supermarket.
A.
has gone
B.
has been
C.
is going
D.
went
【简答题】降速干燥阶段又称为 控制阶段，此阶段内干燥速率不断 ，物料表面的温度不断 。
【单选题】Where is the Lucy now? 查看材料
A.
In Huston.
B.
In the United States.
C.
In the Ethiopia National Museum.
D.
In a secret storeroom.
【单选题】—Where is Lily, Lucy? I cannot find her anywhere. —She_________have been off long. I saw her clea
A.
16．—Where is Lily, Lucy? I cannot find her anywhere. —She_________have been off long. I saw her clean the window just now. A．shouldn’t
B.
can’t
C.
mustn’t
D.
needn’t
【简答题】降速干燥阶段又称为____,其干燥速率的大小取决于____,与外部的干燥条件关系不大。
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