Example sentences of "have be use [to-vb] [det] " in BNC.
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1 | Several methods have been used to detect this response , including agglutination , complement fixation , and enzyme linked immunosorbent assay ( ELISA ) . |
2 | It is free of chlorofluorocarbon gases which have been used to cool most fridges for decades . |
3 | The gases have been used to cool most types of fridges for decades but are now headed for a world-wide ban in 1996 after being blamed for causing holes in the ozone layer , which shields the earth from the sun 's harmful ultraviolet rays . |
4 | Several spectroscopic techniques have been used to examine this effect for CO adsorption on single-crystal metal surfaces , but bond energy changes can only be inferred indirectly from these techniques . |
5 | A number of approaches have been used to achieve this definition . |
6 | Increasingly sophisticated techniques have been used to solve these problems . |
7 | Methods have been used to overcome these problems to some degree . |