材料QT400—18，其中数字400和18表示（）

A.抗压强度和伸长率

B.抗弯强度和收缩率

C.抗拉强度和伸长率

D.抗剪强度和收缩率

A labor market analyst makes the following assertions about trends in labor income: Statement 1: The net effect of technological improvements has been to increase the demand for labor. This can be seen in the long-run increase in real wage rates. Statement 2: The broadest measure of labor income is total wages, salaries, and tips received. Are these two statements correctStatement 1 Statement 2 （）①A. CorrectCorrect ②B. Incorrect Correct ③C. CorrectIncorrect

A. ①

B. ②

C. ③