设a=log0.70.8,b=log1.10.9,则 [ ]
A.b>a>0
B.a>0>b
C.a>b>0
D.b>0>a
答案:B
一、单词辨音:(共5小题;每小题1分,满分5分)
1. honest A. money B. fond C. home D. move
2. wise A. lose B. mouse C. house D. horse
3. match A. compass B. cast C. class D. family
4. argue A. rush B. music C. put D. language
5. speech A. school B. headache C. chair D. Chemistry
C02气体保护焊时若保护不良或C02气体不纯,会在焊缝中产生()。
A.氢气孔
B.一氧化碳气孔
C.氮气孔
D.氧气