测量过程改变，系统误差的大小和方向都不变。
参考答案：对
He told us that the best way to ______ respect was to devote ourselves to ______ high grades.
A．earn; achieve
B．earn; achieving
C．earning; achieve
D．earning; achieve
一幢写字楼的潜在毛租金减去空置损失后得到的是该写字楼的有效毛收入。( )
