... 变力作用 Inotropic action 变时作用 Chronotropic action 变传导作用 Dromtropic action ...
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冠益嗪明显减慢大鼠心率，拮抗异丙肾上腺素的正性变时作用。
The drug markedly slowed the heart rate and antagonized the positive chronotropic effect of isoprenaline.
结论：GST对家兔窦房结具有负性变时作用，并可延长复极化时程。
CONCLUSION: GST exerted a negative chronotropic action and induced a delayed repolarization of pacemaker cells in SA nodes of rabbits.
当臂杆运行到上下两个极限位置时，分别压下限位开关，切断主控电路，变幅电机停车，达到限位的作用。
When the arm runs to the upper and lower two limit position, respectively press the lower limit switch, cut off the main control circuit, variable amplitude motor parking, to limit the role.
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