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【单选题】
桔梗中总皂苷的含量测定采用A.
重量法
B.
硝酸银滴定法
C.
紫外-可见分光光度法
D.
气相色谱法
E.
高效液相色谱法
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举一反三
【单选题】Women are bad drivers in all the following ways EXCEPT
A.
they drive too fast
B.
they often do their makeup in the car
C.
they use too much cell phone in the car
D.
they often miss traffic signals when there is another woman in the car
【单选题】Why didn’t they drive the bear away?
A.
Because the bear was too big.
B.
Because it was dangerous to drive a bear away.
C.
Because the bear ate everything they had.
D.
Because they wanted to play with the bear.
【简答题】A．They could drive the insects away. B．They could keep the plants well-watered. C．They could build devices to trap insects. D．They could protect the plants from severe droughts.
【简答题】A．They could drive the insects away. B．They could keep the plants well-watered. C．They could make the plants grow faster. D．They could build devices to trap insects.
【简答题】Today’s drivers may feel shocked by the high price of petrol when they drive to the gas station. However, the car industry has the technology to solve the problem . It’s the hybrid car（混合动力汽车）. What i...
【简答题】A．They could drive the insects away. B．They could keep the plants well-watered. C．They could make the plants grow faster. D．They could build devices to trap insects.
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