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4.下列关于粉碎与过筛的叙述中正确的是
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5.混合物料可采用的方法有（）
Complete the following paragraph with the correct form of the words given below.commitcontributedevelopfrequentgetlow-paidnumerousotherso whatOver the last two years at university, (1)____________ people I know have worked during the summer vacation doing a(n) (2)___________________ job of some kind because of their need to pay off the debts they (3)____________ while at university. (4)____________ have chosen to do volunteer work, as it's now widely recognized that it's an excellent way of making a(n) (5)________________ to the wider community while at the same time (6)_________________ the social skills required by employers, who, we are told, (7)________________ complain that today's graduates neglect to do (8)___________. From (9)_________________ my friends have told me about volunteering work, it is really worthwhile, and I have (10)_____________ myself to working for the Red Cross for six months soon after my finals, as it is an organization I have great admiration for.
单相桥式整流电容滤波电路是将电容器与整流电路的负载（ ）构成的。
整流输出电压经过滤波电容后，电压脉动减小了，输出电压也下降了。
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