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【单选题】
欲使相同温度的两种稀溶液间不发生渗透,应使两种溶液的:A.
质量摩尔浓度相同
B.
.物质的量浓度相同
C.
渗透浓度相同
D.
质量分数相同
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皮皮学刷刷变学霸
举一反三
【单选题】We had to learn chemical（）at school but I can only remember H 2 O for water.
A.
principles
B.
prescriptions
C.
formula
D.
formulae
【单选题】When the author smelled cut grass again for the first time, she______.
A.
cried out loudly
B.
wept in silence
C.
couldn't help bursting into tears
D.
was in the American Museum of Natural History
【单选题】The author cried on the way home to the local humane society because
A.
she hated to have to send away the dogs.
B.
the dogs might end up being killed in the shelters.
C.
the shelters might refuse to take the dogs.
D.
the new owners might maltreat the dogs.
【单选题】知情同意应当包含的内容错误的是
A.
研究目的、基本研究内容、流程、方法及研究时限
B.
隐藏可能给受试者带来的不适和风险
C.
研究者基本信息及研究机构资质
D.
对受试者的保护措施
【单选题】We had to learn chemical _____ at school, but I can only remember H2O for water.
A.
formulae
B.
forms
C.
formats
D.
forts
【单选题】Ben was busy taking a training class ______ we had to wait for himfor half an hour. [ ]
A.
so
B.
if
C.
or
D.
but
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