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【单选题】
下列属于主动转运的是
A.
安静时 K + 由细胞内向细胞外转运
B.
兴奋时Na + 由细胞外进入细胞内
C.
葡萄糖由细胞外液进入一般细胞
D.
Na + 由细胞内向细胞外转运
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【单选题】Remember that this special offer _________ on May 1st.Don't miss it!
A.
expires
B.
completes
C.
finishes
D.
goes
【单选题】Remember that this special offer _____ on May 1 . Don't miss it.
A.
expires
B.
completes
C.
finishes
D.
goes
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A.
正确
B.
错误
【单选题】It is important to remember that an inerted atmosphere may become flammable again if air is admitted _________.
A.
during routine measuring
B.
on venting the mixture to atmosphere
C.
during gas freeing with air
D.
all of the above
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【简答题】某燃气轮机装置定压加热理想循环中,工质视为空气。空气进入压气机时的压力为0.1MPa,温度为17℃。循环增压比π=6.2,燃气轮机进口温度为870K。空气视为理想气体,Cp=1.004KJ/kg*K,k=1.4。试求循环各点的温度、压力、比体积、单位质量工质的循环净功量、循环的热效率
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A.
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室温下
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【判断题】植株再生的理论基础是植物细胞具有全能性,请判断对错:C. 对有些植物是对的D. 不一定
A.
正确
B.
错误
【简答题】某燃气轮机装置定压加热循环(如图所示),循环增压比π=7,增温比τ=4,压气机吸入空气压力P 1 =0.8MPa、t 1 =17℃。压气机绝热效率η C,s =0.90,燃机轮机相对内效率η T =0.92,空气取定比热容,其c p =1.03kJ/(kg·K)、R g =0.287kJ/(kg·K)、κ=1.3863。试求
【单选题】It is important to remember that an inerted atmosphere may become flammable again if air is admitted______________.
A.
 during routine measuring
B.
on venting the mixture to atmosphere
C.
during gas freeing with ai
D.
all of theabove
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