根据车钟记录簿记载规定,下列哪个符号表示完车()。
A.√√
B.√
C.×
D.○
参考答案:D
I used to love that film __I was a child, but I don't feel it that way any more. [ ]
A. once
B. when
C. since
D. although
重级工作制的起重机,钢丝绳安全系数应为()。
A.5
B.10
C.6