用400nm的光垂直照射一光栅，观察到第四级明纹的衍射角为30求第几级光谱，若第三级条纹为第一个缺级

I'm sorry to have borrowed the magazine since so many days.改错,急, I have borrowed the new magazine from my friend.The new magazine _______ _________ ______ from my friend. do you have all the back numbers of this magazine.请问这句话的意思, MR THE SWORDSMAN是什么意思?翻译成中文 There will（ ）hundreds of trees on the mountain.为什么用be而不用have?啥时候用be?啥时候用动词原形? 3星大厨 THE CHEF怎么样 The chef.烘焙课程二十五岁还可以吗? The importance of a sous chef 英语翻译谢谢帮忙翻译成中文地址. Lovely piggy collagen piggy pack 打印机里的硒鼓英文该怎么说RT~~~谢谢了因为打印机的硒鼓坏了,又不知道英文该怎么说,所以一直拖着没换,急用.谢谢~~~~~thnx! 我想知道快高使用方法啊,有人尝试过了吗 快高使用方法有哪些是要注意的啊 Chinese name口语问题,请用英文回答1.What’s the tradition of naming a child in Chinese culture?(or:How do people name their children in our culture?Anything interesting in this respect?) 2.What's the difference between Chinese name culture 英语选择题Mr Li was ill,____Mr Zhang took his lesson____him. A.so,instead B.so,instead of 在英文名字里面加个China可以吗比如说我可以叫China Lulu吗? 打印机用英文怎么说(⊙⊙?) hold me tlght.keep me warm. hlod me tight and keep me 请问Who needs to keep me warm You always keep me safe and You always keep me safe and warm 注册made in china 时,需要填写我的个人信息,填写full name时是按照中国名字的顺序还是按照英文名字的?比如我叫周杰伦,我应该填Zhou Jielun 还是Jielun Zhou? 腊梅吐芳迎红日,绿柳展枝舞春风 是表示什么民俗节日的? 春来绿柳舞春风的上联 下联：“绿树展枝舞春风”求上联 My heart is uncomfortable more and 上联春风一扫千山绿 下联是什么?一定要正确哦! 它们（）跳舞,（）随着春风生长.小 草马路边,河岸上,不起眼的小草使大自然充满生机.春天,一阵微微的春风吹来,小草和刚睡醒的伙伴们跳起了欢快的舞蹈.他们一边跳舞,一边随着春风生长. —Will you pass me today's newspaper?—________横线上填"Here you are."和“You are welcome.”哪个好 不须蜂蝶频频顾只向春风淡淡开是什么意思 __in all parts of the state,pines are the most common trees in Georgia.A,they are found B,finding C,found D,to find them.答案是C,其他为什么不对?