平均读数法就是将水平仪两次测量气泡的直接读数值取算术平均值的测量方法。
参考答案：错
大柴胡汤为什么重用生姜？
As a salesman, he works on a (an) ______ basis, taking 10% of everything he sells.
A．salary B．pensionC．commission D．income
