为什么氧气不能与油脂接触？

进入初中以后，比起小学学习，初中学习有哪些新特点      

①课堂上能学到更多的知识  

②课外可以运用已经获得的知识和能力，学习一些课堂上学不到的知识   

③课外时间多了，能阅读更多的参考书籍 

④初中的课程对能力的要求不高

A．①②③

B．②③④

C．①②④

D．①②③④

已知|x|=4，y²=25，且x，y异号，求x+y的值．

单词填空

小题1:I can’t tell you the __________(确定的) time when I will come.

小题2:More than 100 million copies of this book have been _________ (发行) around the country.

小题3:Faithfulness is one of the main ___________(特点) of dogs.

小题4:It is urgent to raise public __________(意识) of environmental protection.

小题5:The criminal was sentenced to prison for ________(偷窃).

小题6:It is c____________ of you not to play the piano while I was asleep.

小题7:The school organizes its students to do v________ labor, that is without any pay every Friday .

小题8:College students are encouraged to take part-time jobs to a___________ social experience needed for the future career.

小题9:My brother is a very s___________ person. Once he has made up his mind, nothing can change it.

小题10:His speech was constantly i_________ by the audience’s warm applause(鼓掌).

男性，51岁。因患胃癌行胃大部切除，手术后2d起咳嗽，痰呈黄脓性，体温39℃，稽留热型。X线胸部摄片示右中肺野大片浸润阴影，并见空洞和液平。痰培养多次为金黄色葡萄球菌。曾应用青霉素、苯唑西林、头孢呋辛、头孢噻肟、头孢他啶、阿米卡星等，病情不见改善。本例肺脓肿应考虑是下列哪型金黄色葡萄球菌引起（）

A.耐甲氧西林金黄色葡萄球菌（MRSA.

B.产青霉素酶金黄色葡萄球菌

C.凝固酶阴性金黄色葡萄球菌

D.凝吲酶阳性金黄色葡萄球菌

E.溶血性葡萄球菌

目前，我国会计电算化管理制度已经完善。