各国个人所得税普遍坚持“累进税制度”，体现出税收的（）。

[单选题]Research Is a State of Mind For many years there has been much misunderstanding as to just what research is. The popular conception seems to be that there is something mysterious about it， and before any research can be done it is necessary to have expensive scientific apparatus and large， elaborately equipped laboratories. Actually， this is not so. （6） It is a simple， organized way of trying to accomplish something you wish to do—so simple that anyone can do research anywhere at any time. First， you select the problem you would like to solve， then you list at least ten reasons why it has not been solved. （7） It takes just as much effort to solve a useless problem as a useful one. （8） After carefully—and I want to emphasize that word “carefully”—selecting the problem and the ten things between you and the solution， you then use the same procedure as in solving a crossword puzzle.（9）In the solution of the remaining obstacles you may need some simple apparatus， but the things you will probably need most are infinite patience and persistence. Few people realize the difficulties of doing any new thing. Maybe one of the reasons people are so easily discouraged is because of their education. During all our years at school we were examined two or three times a year. If we failed once， we were out. （10）If we are going to make progress， we must learn to fail intelligently so that we won't become discouraged at the 99.9 per cent failure. 9.（）

[单选题]人类利用微生物资源开发的产品有（）

[单选题]胶样粟丘疹（）。

[单选题]用砷剂治疗牙齿见于（）

[判断题]综合防雷设备的电源防雷箱地线、分线盘防雷地线应单独入地。

[单选题]关于菌血症正确的说法是（）

[单选题]女性，43岁。左侧听力下降伴左侧面部不适7个月，根据CT图像（见图），最可能的诊断是（）

[单选题]典型的焚烧厂烟气处理设施分为干式、半干式和湿式三类，典型的湿式处理流程包括吸烟塔与（）的组合。

[单选题]（）年我国第一汽车制造厂建成投产.

[多选题]皮肤黏膜淋巴结综合征的诊断，除长期发热外，尚有（）