乳剂制备前除哪一项外，均须注意( )A．分散相的体积比应在25%～50%之间B．油
题型：单项选择题
问题：
乳剂制备前除哪一项外，均须注意( )
A．分散相的体积比应在25%～50%之间
B．油相的种类
C．乳剂的类型及乳化剂的HLB值
D．调节乳剂的黏度和流变性
E．必要时要加入抗氧剂、防腐剂
题型：单项选择题
B
Volunteers, as an essential part of a successful world exposition, are a major channel for the public to participate in, serve and share the world exposition and a means to showcase the image of the host country and city. The following information is about the volunteer for the World Exposition 2010 Shanghai China．
I．Basic Requirements for Volunteers
● Be willing to participate in voluntary services of Expo 2010;
● Age limit: Expo Site volunteers must be born before April 30,
1992 and Expo City Voluntary Service Station volunteers before
April 30, 1994;
● Obey the laws and regulations of the PRC;
● Be able to participate in training and relevant activities before the opening of Expo 2010;
● Possess necessary knowledge and skills needed by the position;
● Be in good health to meet the requirements of corresponding voluntary positions．
II．Further Information for Volunteers
● Source
Residents of Chinese mainland, Hong Kong, Macau and Taiwan, as well as overseas Chinese, and foreigners can all apply to be the volunteers．
● Signup methods
Applicants may log in onto the official websites for online signup．They may also consult or connect with the Expo Volunteer Stations．
● Time
May 1 - December 31, 2009
Ⅲ．Volunteer Training
Volunteer training includes general training, special training and position training．General training is carried out through internet, while special training and position training are provided through classroom lectures and field practice．
IV．Volunteer Types
● Expo Site volunteers refer to those offering voluntary services to visitors and the Organizer in the Expo Site, mainly including information, visitor flow management, reception, translation and interpretation, assistance for the disabled, and assistance in media service, event and conference organization and．volunteer management．
● Information booth volunteers are stationed in the Expo's information booths at key transportation centers, commercial outlets, tourist attractions, restaurants, hotels and cultural event places outside the Expo Site．They offer services including information, translation, interpretation and even first aid．
60．If you were born in April 1993, where can you be a volunteer?
A．In the Expo City． B．In the host country．
C．In the Expo Site． D．In Chinese mainland
61．Which of the training will be done on the Internet?
A．Position training． B．General training．
C．Classroom training． D．Special training．
62．Which of the following service is offered by information booth volunteers?
A．Visitor flow management． B．Helping the disabled
C．Assistance in media service． D．Emergency First aid．