什么是测量仪器示值误差？
参考答案：
测量仪器示值误差是指测量仪器示值与对应输入量的真值之差。
函数f（x）=sinx+cosx-sinxcosx的最小值为______．
The fact she has not said anything at the meeting all of us.
A．what; surprised
B．what; was surprised
C．that; surprised
D．that; was surprising
