通用无线通信协会
参考答案:
这个行业机构代表了AMPS和TDMA(ANSI-136)移动网的厂商、运营商和用户的利益。
After _______ absence of 10 years from his hometown, Mr. Li doesn't know _______ great changes have taken place there.
A.an;/
B.an; the
C.the; a
D./;the
缆索吊装设备按其用途和作用可分为( )等基本组成部分。
A.主索
B.工作索
C.塔架
D.锚固装置
E.扣索