简述房地产的自然特性有哪些？
影响药物从肾脏排泄速度的因素有（） ["药物极性","尿液pH","肾功能状况","给药剂量","同类药物的竞争性抑制"]
感觉适应是（）心理现象。 ["A.感受性发生了变化的 ","B.刺激物持续作用引起的 ","C.刺激作用停止后出现的 ","D.两种刺激同时作用时引起的"]
夏天原料气中含水量和冬天原料中含水量比较结果为（）（进料压力未变） ["夏天低天冬天","两种工况一样","夏天高于冬天"]
You want to implement a master-detail relation between data blocks based on object tables. How would you do this? （） ["Create the relation manually and coordinate the blocks using triggers. ","Base the relation on a REF pointer using the Data Block Wizard. ","Base the relation on a foreign key using the Data Block Wizard. ","This task is not possible because master-detail relations can be implemented only for blocks based on relation tables."]
论述往复活塞式压缩机气缸过热的原因。
