直流电流表和电压表量程扩大方法有什么不同？
["\u7b54\uff1a\u76f4\u6d41\u7535\u6d41\u8868\u6269\u5927\u91cf\u7a0b\u901a\u8fc7\u5728\u7535\u6d41\u8868\u4e0a\u5e76\u8054\u7535\u963b\u6765\u5b9e\u73b0\uff0c\u7535\u538b\u8868\u6269\u5927\u91cf\u7a0b\u901a\u8fc7\u5728\u7535\u538b\u8868\u4e0a\u4e32\u8054\u7535\u963b\u6765\u5b9e\u73b0\u3002"]