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【单选题】
水的硬度测定时,取水样100.0ml,用0.01000mol/L EDTA滴定,用去3.40ml,则这水样中Ca2+的浓度为A.
3.40×10—5mol/L
B.
0.0340mol/L
C.
3.40×10—4mol/L
D.
3.40×10—7mol/L
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举一反三
【单选题】()We have no time to waste and must make sure that nothing about the project fall schedule.
A.
back
B.
Rover
C.
down
D.
behind
【单选题】—Must the government of Philippines (菲律宾政府) say sorry to China？ —Yes, they __________. Their behaviour has deeply hurt Chinese people.
A.
need
B.
must
C.
can
D.
may
【单选题】—Not getting that job was a big let-down. —Don't worry. Something better will ________. [ ]
A.
fall behind
B.
take on
C.
go by
D.
come along
【简答题】We must not fall behind the _________ . (time, times)
【单选题】–It’s erous here. We must not let people fall down. --You’re right. Come on!
A.
stop... by falling
B.
keep...falling
C.
protect...falling
D.
pr...from falling
【单选题】下列关于稳态时总传热系数和对流传热系数关系的讨论哪个错误？
A.
总传热系数的关系关联了对流传热系数的影响
B.
稳态时间壁两侧对流传热速率应该是相等的
C.
两侧对流传热系数对总传热系数的贡献率以大者为大
D.
空气和水的间壁换热，总传热系数是由空气一侧的对流传热系数主导决定的
【简答题】热导率的单位为______，对流传热系数的单位为______，总传热系数的单位为______。
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