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简述β-内酰胺类抗生素的结构特点与性质。

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AOL Wallet makes shopping online faster and easier for you. When you shop on AOL,you can have checkout forms automatically Filled in with your billing and shipping information. You enter your information one time, and then AOL？ Wallet will enter it for you in the future .
To make things more convenient., if you currently pay for your AOL.Monthly service with a credit card, you can use that billing information in your AOL？ Wallet allows you to store up to 10 credit cards and 50 shipping addresses so you don&39;t have to search for the right credit card, or scramble to find that old birthday card with your sister&39;s return address label when you&39; re making your purchases.It&39;s all available for you in your AOL？ Wallet.
AOL takes online privacy very seriously and we will never disclose AOL？ Wallet User Informational except to complete an online purchase you have requested or as permitted by law. We also value your safety and security. So we&39;ve taken the extra step of protecting your AOL Wallet with your Account Security Question, which you may have created when registering for AOLor when logging into the AOLservice .
If you don&39;t already have an Account Security Question, you can sign up for one at AOL
Keyword: Account Security Question.
What can AOL Wallet allow you to store？
AOL Wallet allows us to store up to__and 50 shipping addresses.
What does AOL take seriously and will never disclose AOL Wallet User Information except on your request or aspermitted by law？
AOL takesvery seriously
What does AOLvalue？
AOLvalues the user&39; s.
What may you have created when registering for AOL or when logging into the AOLservice？
We may have created_.
What is AOLkeyword for signing up for an Account Security Question？
The AOLkeyword is___.

急性髓性白血病

Directions: The following is a list of terms related to airlines service. After reading it, you are required to find the items equivalent to (与……等同) those given in Chinese in the table below. Then you should put the corresponding letters in brackets on the Answer Sheet, numbered 6 through 10.
A—Frequent flight passenger
B—Flight number
C—Boarding time
D—Starting airport
E—Ground service
F—Delayed flight
G—Ticketing service
H—Ticket delivery
I—Online ticket booking
J—Luggage check-in
K—Self check-in service
L--Seat selection
M—Flight punctuality
N—Ticket refund
O—Baggage claim
P—Baggage compensation
Q—First class
6.行李托运登机时间
7.售票服务常旅客
8.始发机场航班延误
9.座位选择送票服务
10.行李提取航班号

《图内拉河上的天鹅＞是____的作品。