下列哪种工种可引起矽肺
A．水泥厂包装工
B．煤矿挖煤工
C．电焊工
D．石灰厂出窑工
E．铸造厂铸件清砂工
参考答案：E
The teacher, together with his students __________ discussing Writing Skills that __________ newly published in China.
A. are; were B. is ; were C. are; was D is ; was
税率是据以计算应纳税额的比例，它体现征税的深度，也直接关系到国家财政收入和纳税人的负担，我国现行的税率，按税率和税基的关系划分，主要有以下( )类。
A．分档税率
B．比例税率
C．平均税率
D．累进税率
E．定额税率
