题干

莎普爱思眼药水适用于早期老年性白内障,有效成分之一苄达酸结构如图所示。下列关于苄达酸的叙述正确的是(   )

A:分子式为C16H16N2O3   

B:属于芳香族化合物,且有弱酸性

C:苯环上的一氯代物有5种   

D:该物质属于酯类

上一题 下一题 0.0难度 选择题 更新时间:2015-12-18 05:27:45

答案(点此获取答案解析)

B

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    TEEN ZONE

    ANNOUNCEMENTS

    At the Newton Public Library

    REGISTER FOR A SUMMER OF STORIES

    Sign up and receive your reading log at the Circulation Desk. Record books you read over the summer and have a parent sign next to each title. The top five readers will receive prizes such as gift cards, magazine subscriptions, and movie tickets.

    TEEN ZONE RESOURCES

Look to the Teen Zone's “Ready Reference” comer for all the help you need to locate information on the Internet. Ms. Frye, the librarian, will share tips on keyword searches to find interesting information about certain books. You must have a signed parent permission slip before using the computers. Access is limited to 30 minutes and is on a first-come, first-served basis.

    EVENTS

    Poetry Session                Monday, June 16                6:00-8:00 P.M.

    Teen poets can be literary celebrities for a night by reading their original work at this special event. Friends and family members are encouraged to attend and show their support. A few original poems may be selected for publication in the next library newsletter. Food and drinks will be provided

Learn Origami                Wednesday, June 4                3:00-4:00 P.M.

    This class provides books and instruction in the ancient Japanese art of folding colourful squares of paper into shapes, such as birds, insects, or flowers.

Eco Crafts with Jasleen        Wednesday, June 11            3:00-4:00 P.M.

    Make earth-friendly crafts from recyclable materials. With guidance from a talented teacher and books, you will make new creations from everyday items. Start recycling today, and bring items to share with the group.

Magazine and Book Art        Wednesday, June 18            3:00-4:00 P.M.

    The library needs to beautify the walls of the Teen Zone. We will be transforming artwork from old books and magazines into unique masterpieces to frame and hang on the walls. Put your creative spin on some photographs, and help ensure that the Teen Zone remains the highlight of the library.

    Note: Registration is required for all the events. Register at the Circulation Desk or by calling 1-800-290-5992. Space is limited, so reserve your spot soon!