简述森林火源的种类。
参考答案:
1>生产性用火:烧荒烧碳、炼山造林、其它
2>非生产性用火:野外吸烟、取暖做饭、旅游烧烤、上坟烧纸、小孩玩火、痴呆弄火等.
3>故意放火
---- Our holiday cost a lot of money.
---- Did it ? Well, that doesn’t matter_______ you enjoyed yourself.
A.as long as
B.unless
C.as soon as
D.though
就临床所见,上消化道出血最多见于()
A.空肠上段
B.胆道
C.食管
D.屈氏韧带的近端
E.胃