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【简答题】
一台三相步进电机,若采用三相单三拍的通电方式工作,并且保证其步矩角为1.5°,则该电机转子的齿数应是多少?
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反馈参考答案：
举一反三
【单选题】The Carnegie Foundation report says that many colleges have tried to be 'all things to all people'. In doing so, they have increasingly catered to a narrow-minded careerism while failing to cultivate ...
A.
satisfy the needs of all kinds of students simultaneously
B.
focus on training students in various skills
C.
encourage students to take as many courses as possible
D.
make learning serve academic rather than productive ends
【多选题】操作变量的选择时应该遵循一定的原则,下列说法正确的是( )
A.
操作变量在工艺上是允许调节的、可以控制的变量
B.
要考虑工艺上的合理性,生产上的经济性
C.
操作变量的作用比其它干扰对被控变量的影响更加灵敏
D.
干扰通道的放大系数尽可能小些,时间常数尽可能大些
【简答题】试述操作变量的选择原则。
【多选题】操作变量选择的原则
A.
负荷可以作为操作变量
B.
生产过程中的主物料流量可以作为操作变量
C.
生产过程中对被控变量有所影响的变量都可以作为操作变量
D.
操作变量应是可控的。
E.
操作变量应具有较高的灵敏度
【单选题】被控变量的选择原则下面哪种说法不合理?
A.
被控变量应能代表一定的工艺操作指标或是反映工艺操作状态的重要变量
B.
被控变量应是能测量的，并具有较大灵敏度的变量
C.
特别容易控制的变量
D.
被控变量应尽可能选择工艺生产过程的直接控制目标，当无法获得直接控制指标信号，或其测量或传送滞后很大时，可选择与直接控制指标有单值对应关系的间接控制指标
【单选题】The Carnegie Foundation report says that many colleges have tried to be 'all things to all people'. In doing so, they have increasingly catered to a narrow-minded careerism while failing to cultivate ...
A.
satisfy the needs of all kinds of students simultaneously
B.
focus on training students in various skills
C.
encourage all sorts of people to attend college
D.
make learning serve academic rather than productive ends
【单选题】The Carnegie Foundation report says that many colleges have tried to be 'all things to all people'. In doing so, they have increasingly catered to a narrow-minded careerism while failing to cultivate ...
A.
satisfy the needs of all kinds of students simultaneously
B.
focus on training students in various skills
C.
encourage students to take as many courses as possible
D.
make learning serve academic rather than productive ends
【单选题】患者女,反复发作右上腹绞痛3个月,并向右肩部放射。右上腹轻度压痛,肝不大,未扪及包块。首选的检查是
A.
胃镜检查
B.
肝功能检查
C.
静脉胆道造影
D.
口服胆囊造影
E.
B超
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