当被测量的函数形式为：Y=A<sub>1</sub>X<sub>1</sub>+A<sub>2</sub>X<sub>2</sub>+„+A<sub>N</sub>X<sub>N</sub>，且各输入量不相关时，合成标准不确定度u<sub>c</sub>（y）（）。<br>A:<img src="/Image1/d0/d05eae3748667da43fa279eafa2192bf.png" /><br>B:<img src="/Image1/a6/a6127393f6e59e9c31b0e33bd3a086a7.png" /><br>C:<img src="/Image1/b9/b92a18447d93cd44a693148df2b523d8.png" /><br>D:<img src="/Image1/77/777b0cbb38d3a88d74b60b8f680040ac.png" />