Example sentences of "have be used [to-vb] [det] " in BNC.
Next page| No | Sentence |
|---|---|
| 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 . |