在一定剂量范围内，药物剂量的大小与血药浓度的高低成，亦与药效的强弱有关;这种剂量与效应的关系称量效关系
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He can not choose his own job, ________ can I.
Weather _______, we ’ll go out for a walk.
He shook hands with the visitors ________ as to convey his apology.
________ Tom has done really amazed everyone in his class.
There is always a ready market ____ Sewing Machi nes, provided they are ___ good quality and competitive in price.