Friends who have studied chemistry will know that in chemical experiments, it is often inseparable from a simple operation - stirring. It is hard to believe that in the 18th century, this simple operation, surprisingly...
12-05
The famous Vienna International Centre, austria's capital, leases to the United Nations every year at a low rent of only one Austrian shilling (equivalent to three cents of the renminbi). This seems to be a...
11-10