调整质量流量计零位时应注意什么?
参考答案:
①仪表先通电预热,一般需30分钟;
②启动流体运行,直至传感器温度等于流体的操作温度;
③切断下游阀,并确保无泄漏;
④保证流体满管。
(71) analysis emphasizes the drawing of pictorial system models to document and validate both existing and/or proposed systems. Ultimately, the system models become the(72)for designing and constructing an improved system. (73) is such a technique. The emphasis in this technique is process-centered. Systems analysts draw a series of process models called(74) . (75) is another such technique that integrates data and processConcerns into constructs called objects.
A.Prototyping
B.Accelerated
C.Model-driven
D.Iterative
男性,60岁,有高血压病史10件年,平素血压常在(21~24)/(13~14)kPa【(160~180)/(95~100mmHg)】,近两年来常感心悸、活动明显。3天前因情绪激动,上述症状加重,且不能平卧而入院。体检:半卧位,心界向左下增大,心率100次/分,偶闻期前收缩,A2亢进,双肺对称性哮鸣音,血压为28/15kPa(210/110mmHg)。该病人首选下列哪项处理最合理()。
A.舌下含服心痛定
B.肌注利舍平
C.静脉滴注硝普钠
D.静脉注射氨茶碱
E.口服卡托普利(巯甲丙脯氨酸)