题目内容
紫外分光光度法测定样品，仪器进行基线校准时，应该选择（）进行校准。
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紫外分光光度计测定样品，通过光栅获得单色光光源。
Listen to a dialogue and decode the message by finding out the correct choices in brackets according to what you have heard.[音频]Chen is invited to George’s party. And she has brought along a freshly 1(made, take, baked) cake with her. George is her friend from 2(Africa, Australia, America) . He is very happy when Chen tells him that she wouldn’t miss the party for the 3 (word, world, award) . He takes this as a (an) 4 (accomplishment, complement, compliment) . After they greet each other, George tries to introduce Chen to his friends. But Chen doesn’t want to 5 (introduce, interrupt, influence) others, since all of them seem to be enjoying themselves. So George stops talking and asks Chen to 6 (drink, dance, rest) with him. But Chen says she needs to have some wine to get in the 7 (wood, mood, food) first.
有一单相桥式整流电容滤波电路，若变压器二次电压为10V，直流负载电阻为10Ω，测得输出电压为
5.一个直流稳压电源的基本组成部分必须包括 环节、环节 环节和 环节四大部分。
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