【多选题】
压力表在测量___介质时，一般在压力表前装隔离器。
A. 粘稠；
B. 稀薄；
C. 气体；
D. 水。
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答案
A
解析
暂无解析
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A. 热电极在使用中氧化，特别是某些元素在使用中选择性的氧化和挥发；
B. 热电极受外力作用引起形变所产生的形变应力；
C. 热电极在高温下晶粒长大；
D. 热电极的沾污和腐蚀。
【多选题】
在标准节流件中，孔板压损最大，为保证运行的经济性，对压损有严格限制，压损一般不允许超过___。
A. 60KPA；
B. 40KPA；
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D. 100PA、
【多选题】
正确选择气动调节阀的作用方式-气开（气关）式，应从___几方面考虑。
A. 在事故状态下工艺系统和相关设备应处于安全条件；
B. 在事故状态下尽量减少原材料或动力的消耗，保证产品质量；
C. 在事故状态下考虑介质的特性，如有毒、有害、易燃、易爆等；
D. 制造工艺及造价。
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主控拨码开关设置原则___。
A. 从上到下，ON为0，OFF为1；
B. 从下到上，ON为0，OFF为1；
C. 从上到下，ON为1，OFF为0；
D. 从下到上，ON为1，OFF为0。
【多选题】
自动保护装置的作用是当设备运行工况发生异常或某些参数超过允许值时，发出报警信号，同时___避免设备损坏和保证人身安全。
A. 发出热工信号；
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D. 发出停机信号。
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