Under what circumstances would "none of the above" be the correct answer?
在什么情况下“以上都不匹配”才是正确的答案?
2
Make sure before you drop that it is under the correct category, if more than one exists.
如果存在的不止一个,并确保您在放置它之前它是在这个正确目录之下的。
3
But they could cause a proton to decay — a very big deal, if it turns out to be correct, since proton decay isn't allowed under the current Standard Model of particle physics.