锤造全冠一般为
A.刃状边缘B.凿状边缘C.凹形边缘D.肩台形边缘E.斜面形边缘
参考答案:A
Some students are seriously ill and they can't class for several days. [ ]
A. give
B. attend
C. make
D. assume
根据《中国移动900/1800MHzTDMA数字蜂窝移动通信无线网工程验收规范》,如铁塔高度超过()m,馈线应在铁塔中部增加一处接地。
A.50
B.55
C.60
D.65