应答器系统有什么组成？
植物在幼嫩部位首先表现缺（）症状。 ["N","P","Ca","K"]
Centrifugal pumps can be designed with a number of impellers （） to attain a high final delivery pressure. ["in series","in parallel","either A or B","None of the above is tree"]
根据劳动争议性质的不同，劳动争议可区分为（） ["权利事项争议","调整事项争议","个别争议","集体争议"]
植物很多生理活动都受天气影响。在光照充足的下雨天，下列哪一项生理活动基本停止？（）。 ["光合作用","根部呼吸作用","叶面蒸腾作用","根部吸水"]
DMI界面有哪几个显示区？
