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
