フリー問題

問題文

The utility adds a second pressure switch on the trunk main, so that a burst is expected once in eighty years rather than once in forty. What a burst would do to the two streets is unchanged. The register entry has to name the field this change moves and what the remaining figure has to meet. Which pairing belongs in the entry?

選択肢

1. The register entry shows the frequency field that this second switch moves, and the same specification has to put down the acceptance limit that the residual figure meets.
2. The register entry shows the frequency field that this second switch moves, and the same specification has to put down the avoidance limit that the residual figure meets.
3. The register entry shows the consequence field that this second switch moves, and the same specification has to put down the avoidance limit that the residual figure meets.
4. The register entry shows the consequence field that this second switch moves, and the same specification has to put down the acceptance limit that the residual figure meets.