电子实物校验装置由哪些组成?
参考答案:
由称体、称重传感元件,自校传感元件,料斗,砝码,放料机构,电气控制系统组成。
Critics believe that the control of television by mass advertising has () the quality of the programs.
A.affected
B.effected
C.lessened
D.declined
蜻蜓的稚虫生活在水中,通过鳃进行气体交换,其直肠鳃在发育过程中起源于()
A.外胚层
B.内胚层
C.中胚层
D.无法确定