用95%和45%的乙醇配制75%的乙醇溶液500ml,应取95%和45%的乙醇各多少毫升A.250ml,250mlB.200ml,30
用95%和45%的乙醇配制75%的乙醇溶液500ml,应取95%和45%的乙醇各多少毫升
A.250ml,250ml
B.200ml,300ml
C.300ml,200ml
D.225ml,275ml
E.275ml,225ml
用95%和45%的乙醇配制75%的乙醇溶液500ml,应取95%和45%的乙醇各多少毫升
A.250ml,250ml
B.200ml,300ml
C.300ml,200ml
D.225ml,275ml
E.275ml,225ml
用95%和45%的乙醇配制75%的乙醇溶液500ml,应取95%和45%的乙醇各
A.250ml,250ml
B.260ml,240ml
C.300ml,200ml
D.245ml,255ml
E.350ml,150ml
用95%的乙醇配制75%的乙醇500ml,下面配制正确的是()。
A.量取95%乙醇395ml,用水稀释至500ml
B.量取95%乙醇395ml,加入水105ml,混匀
C.量称95%乙醇375ml,用水稀释500ml
D.量取95%乙醇375ml,加入125ml水混匀
若配制75%的乙醇1000ml,则需95%乙醇的量为
A.783.5ml
B.638.5ml
C.789.5ml
D.1266.7ml
E.2338.0ml
配制75%乙醇溶液100ml,需95%乙醇
A.97ml
B.80ml
C.65ml
D.79ml
E.60ml
若需配制75%乙醇2000ml,应量取95%乙醇
A.736ml
B.1105mI
C.1356ml
D.1579ml
E.1675ml
配制75%乙醇溶液100ml,需95%乙醇
A.60ml
B.75ml
C.80ml
D.79ml
E.85ml
配制75%酒精溶液500ml,需用95%乙醇多少
A.325ml
B.355ml
C.395ml
D.425ml
E.455ml
配制75%乙醇溶液500ml,需用多少95%乙醇
A.325ml
B.355ml
C.395ml
D.425ml
E.455ml
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