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境内企业直接或间接到境外发行证券或将其证券在境外上市交易,必须经国务院证券监督管理机构或者国务院授权的部门依照国务院的规定批准。()

A. 对
B. 错

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在招股说明书或招股意向书刊登后至获准上市前,如公司发生重大事项,应将有关说明提交证监会,并应于提交当日立即刊登补充公告。()

A. 对
B. 错

在黄酮类化合物中,黄酮()

A. 三碳链的2,3位上有双键,而3位无羟基
B. 三碳链的2,3位上有双键,而3位有羟基
C. 三碳链的2,3位上无双键,而3位无羟基
D. 三碳链的2,3位上无双键,而3位有羟基
E. 三碳链的1,2位处开裂,2,3位与4位羟基构成α,β-不饱和酮

When you make your travel arrangement to Oxford, Ohio, you should make plans to arrive here at least a week before classes begin. So you can get to know the University and the area. The University holds a short guiding program for all new foreign students before your decision for classes, and you will be expected to attend this program.A valuable service to foreign students traveling to the U.S. is provided by the International Student Service (ISS) in New York, which is well-known for its good work. If you send your travel plan to the ISS, someone will meet you at the port of entry to the U.S., and provide other help. There is no payment for these services. For more information, contact:International Student Service356 West 34th Street, Third FloorNew York 10017 USAWhen you arrive in Oxford, you should first visit the office of ISS. The director will help you find the place of your stay, answer questions, and help in other ways. This office is at your service throughout your entire stay here.1) Students to Oxford are suggested to arrive (46) before classes start.2) Students are supposed to attend a (47) before they decide which class to take.3) International Student Service provides many valuable services for (48) .4) ISS is situated (49) .5) Your first stop at Oxford should be the (50) 46()

硫黄菊素是()

A. 黄酮类化合物
B. 异黄酮类化合物
C. 查耳酮类化合物
D. 花色素类化合物
E. 橙酮类化合物

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