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【单选题】
在分光光度法中,测得的吸光度值都是相对比溶液的,是因为A.
吸收溶剂对入射光有吸收和反射作用
B.
入射光为非单色光
C.
入射光不是平行光
D.
溶液中的溶质产生离解、缔合等化学反应
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【单选题】Something must have happened on their way here. O r they by now.
A.
should have arrived
B.
should arrive
C.
would have arrived
D.
would arrive
【单选题】—Do you have a minute? I've got something to tell you. —OK, you make it short. [ ]
A.
now that
B.
if only
C.
so long as
D.
every time
【单选题】If you arrive early in an American party, how will other people think of you?
A.
You are punctual and polite.
B.
You are a busy and important person with lots to do.
C.
You have no life of your own.
D.
You are leading an exciting and productive life.
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