请表述CD13-18D型电动葫芦。
参考答案：
CD1为常速，3为额定起重3T，18为起升高度18m，D为电动小车式。
圆周率π就等于3.14．______．
I left for the office earlier than usual this morning ______ traffic jam.
A. for the sake of B. in case of C. at the risk of D. in spite of
