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问题 单项选择题

聚乙烯醇有哪些特点是错误的（）

A.俗称IBC

B.永久性栓塞剂

C.对血管产生机械性阻塞

D.不被机体吸收，化学降解很慢

E.可压缩性和在膨胀性优于明胶海绵

答案

参考答案：A

单项选择题

车削细长轴时，由于工件刚度不足造成在工件轴向截面上的形状是（）

A、矩形

B、梯形

C、鼓形

D、鞍形
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单项选择题

Are the following two statements about the elasticity of labor demand correct Statement 1: Labor demand is more elastic in the short run than in the long run because other factors of production are fixed in the short run. Statement 2: The more labor-intensive a firm’s production processes, the more elastic the firm’s demand for labor will be. Statement 1 Statement 2 （）①A. CorrectCorrect ②B. CorrectIncorrect ③C. Incorrect Correct

A. ①

B. ②

C. ③
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