根据《起重机安全标志和危险图形符号总则》(GB15052-2010)规定,警告标志的符号框应为()
A.红底白字
B.白底红字
C.桔黄色底黑字
D.黄底黑字
参考答案:C
Wang Ping flashed a switch on a computer screen, and a table and some chairs _________ the floor
as if by magic.[ ]
A. rose from
B. raised from under
C. rose from under
D. arose from
钢丝绳牵引带式输送机中分绳轮的作用?