According to the author, user-led innovation
A. should be patented and rewarded with money.
B. is costless thanks to its creator's goodness.
C. has come into the view of more people.
D. couldn't be protected by patent law.
锅炉上的安全阀应每年对其检验、定压()次并铅封完好。
A. 1
B. 2
C. 3
D. 4
关于统一城镇个体工商户和灵活就业人员参保缴费政策规定:城镇个体工商户和灵活就业人员都要参加基本养老保险，缴费基数统一为当地上年度在岗职工平均工资的()。
A. 0.08
B. 0.11
C. 0.2
D. 0.24
图标是一个小的图像，虽然它们的形状各异，但其代表的含义都完全相同。(）
A. 正确
B. 错误
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