公路工程按等级划分，可分为( )公路。A．甲、乙、丙级 B．一、二、三级 C．特级

如何确定电压互感器二次绕组的额定电压UN2

患儿，男，2岁，诊为室间隔缺损，分流量大。护士对家长的健康教育可除外

A．预防肺炎
B．加强体育锻炼
C．进一步诊断检查
D．增加营养，增强体质
E．改善心功能，近期手术

安全工作”四个一样”的内容是什么？

(31) analysis emphasizes the drawing of pictorial system models to document and validate both existing and/or proposed systems. Ultimately, the system models become the (32) for designing and constructing an improved system. (33) is such a technique. The emphasis in this technique is process-centered. Systems analysts draw a series of process models called (34) . (35) is another such technique that integrates data and process concerns into constructs called objects.

（32）是（）

A.image

B.picture

C.layout

D.blueprint

丙烯中的（）可以使催化剂失活。

A、丙烷

B、羰基硫

C、一氧化碳

D、砷