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【单选题】
在以下各类称量中,需要严格地调整天平零点的有A.
称取表面皿质量
B.
用减重法称取试样
C.
用加重法 ( 固定重量法 ) 称取试样
D.
随意
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皮皮学刷刷变学霸
举一反三
【简答题】下列门电路的输出端可否并联使用? (1)具有推拉式输出级的TTL电路；(2)TTL电路的OC门； (3)TTL电路三态门；(4)普通CMOS门；(5)漏极开路输出的CMOS门； (6)CMOS电路的三态门。
【单选题】Which statement about the inert gas system is TRUE ________．
A.
Boiler soot blowers should never be used when the IG system is operating
B.
The boiler will produce the best quality of flue gas for the IG system when the boiler load is very light
C.
The boiler will produce the most quantity of flue gas for the IG system when the boiler load is very light
D.
Flue gas with excessive oxygen content is de-oxygenated in the scrubber
【单选题】When the soot blowers are operating in the oil fuel boiler, the air/fuel ratio must _____ throughout the action, and blowers greased after use.
A.
be increased
B.
be decreased
C.
remain constant
D.
either be increased or remain constant
【简答题】A．课程号 B．课程名 C．课程号、教师名 D．课程号、课程名
【简答题】与门电路和或门电路具有 个输入端和 个输出端。
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