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【单选题】
计算机病毒实质上是
A.
一些微生物
B.
一类化学物质
C.
操作者的幻觉
D.
一段程序
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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
【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. 不一定D. 不完全
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
【简答题】It is important to realize that the same technology that helps us may also harm us. We can pr this from happening by carefully controlling the new technology. As one expert says, "we must remembe...
【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
【单选题】超低温保存一般是把材料保存在( )中。
A.
B.
室温下
C.
- 20度
D.
- 196度
【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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