【单选题】Sign language is said to be very picturesque and exact and can be used internationally except for ______.
【单选题】Language is said to be arbitrary because there is no logical connection between meanings and
【单选题】Language is said to be arbitrary because there is no logical connection between ______ and meanings.
【判断题】螺纹的公称直径是指其大径,圆锥销的公称直径则是指起小端直径。
【单选题】有一台电力变压器 , 型号为 SJL—560/ 10, 其中的字母 “L” 表示变压器的 ( ) 的 。