《内河避碰规则》全文共（）
A.五章48条三个附录
B.五章49条三个附录
C.五章48条四个附录
D.五章49条四个附录
参考答案：B
Which of the following is responsible for 10% of preventable cancer
A．Smoking & alcohol use.
B．Alcohol use & smoking.
C．Indoor smoke & low consumption of fruits and vegetables.
D．Low consumption of fruits, vegetables and alcohol use.
热原是一种致热物质,有时能使恒温动物体温下降。
