是at XX level 还是 in XX level?

是at XX level 还是 in XX level? 是study at xx school还是study in xx school为什么不用at呢？ the sea level 用什么介词?the sea level用什么介词?是above还是over?例句：XX is the highest moutain in the world ____ the sea level. level的介词词组有哪一些比如 at .level之类的,在什么程度是用at level还是on level? at level 还是 on level 牛津高阶上用的的是on a level 表示在同一水平上, 是primar-level还是primary-level? 同源染色体是xx还是x 同源染色体是xx还是x 词组 关于level各种水平（层次）是at all levels 还是on all levels in the mid-twentieth century什么意思?它的范围是19XX还是20XX? decrease of 的意思?sth cause a decrease in XX absorption at 559nm of 0.011这个decrease of 是把absorption降到0.011,还是降了0.011? on in at的区别yaoxiangxide xx What is the title of the head of government at the local level?请问是 town council 还是 mayor 是in lunchtime还是at lunchtime 是at night还是in the night 是at winter 还是in winter? 是in our class 还是at at the New Year 还是in?答案是at