往复泵的流量调节只能采用调节活塞的冲程,才能达到调节流量的目的。()
参考答案:错
解析:可以采用调节活塞的冲程和在泵出口处装旁路管线到进口处达到调节流量的目的。
System analysis is traditionally done top-down using structured analysis based on (1) .Object-oriented analysis focuses on creation of models.The three types of the analysis model are (2) .There are two substages of object-oriented analysis. (3) focuses on real-world things whose semantics the application captures.The object constructed in the requirement analysis shows the (4) of the real-world system and organizes it into workable pieces. (5) addresses the computer aspects ofthe application that are visible to users.The objects are those which can be expected to vary from time to time quite rapidly.
2()
A.function model,class model and state model
B.class model,interaction model and state model
C.class model,interaction model and sequence model
D.function model,interaction model and state model
关于妊娠合并心脏病的处理下列哪项是错误的
A.发绀型心脏病患者经手术矫治,心功能改善为I~Ⅱ级者,可以妊娠B.早孕期有心衰发作者,应于心衰控制后终止妊娠C.换瓣手术的心脏病妇女,由于凝血功能的特殊要求,不宜妊娠D.单纯因二尖瓣病变而心功能恶化的孕期妇女,可以在孕期作心脏矫治手术后继续妊娠E.心功能Ⅲ级以上者,产后不宜哺乳,应予产褥早期回乳