【判断题】Man needs transport engineering because mobility is a basic human need and there is a strong tie between the living standard and transport facilities quality.
【多选题】工程开工之前,安全员应将工程概况、施工方法及安全技术措施,向参加施工的 __进行安全技术措施交底。
【多选题】工程开工之前,安全员应将工程概况、施工方法及安全技术措施,向参加施工合技术措施交底。
【判断题】电话机的传输频带规定为300Hz到3400Hz。
【单选题】From the beginning rivers have played an important part in the life of man. Primitive man used rivers as a means of travel. In ancient times, man settled near rivers or on river banks and built up lar...
A.
since the last century
D.
since a few hundred years ago
【单选题】From the beginning rivers have played an important part in the life of man. Man of the earliest times used the rivers as a means of travel. Today rivers still serve as a great waterway for the transpo...
A.
since the last century
C.
since a few hundred years ago