光缆型号由（）构成。
A.规格代号和结构代号
B.型式代号和用途代号
C.型式代号和规格代号
D.结构代号和用途代号
参考答案：C
Hawking became world-famous in _______.
his thirties in the 1970’s
the thirties in his 1970
his 30s in 1970’s
the thirties during the 1970
目前一般个人计算机字长以64位和128位为主，服务器的字长一般在32位和64位为主。( )
