导引绳、牵引绳的安全系数不得小于（）。
A.2.0
B.2.5
C.3.0
D.3.5
参考答案：C
The international agreement, _____ encourage children not to smoke and help people kick the habit,
was signed on February [ ]
A. intending to
B. being intended to
C. intended to
D. to intend to
违背承诺有哪些处罚？（）
A.3分/次
B.1分/次
C.12分/次
D.48分/次
