HBV的垂直传播是经 （） A.呼吸道吸入 B.胎盘 C.粪-口 D.蚊子 E.皮

上市公司向不特定对象公开募集股份，应满足的条件有（）。

A.最近3个会计年度加权平均净资产收益率平均不低于6%

B.除金融类企业外，最近1期末不存在持有金额较大的交易性金融资产和可供出售的金融资产、借予他人款项、委托理财等财务性投资的情形

C.发行价格应不低于公告招股意向书前20个交易日公司股票均价或前1个交易日的均价

D.采用《中华人民共和国证券法》规定的代销方式发行

社会工作者应充分认识和理解服务对象个体在生理、心理和社会文化等各方面存在的差异，给予服务对象关心和尊重，这体现了社会工作专业价值观的()。

A.服务大众

B.注重能力培养和再学习

C.待人真诚和守信

D.强调服务对象个人的尊严和价值

应收集和保管试运行质量记录的是( )。

A．承包商
B．供应商
C．业主
D．咨询工程师

具有确诊意义的检查是

A．冠状动脉造影

B．24小时动态心电图

C．心肌核素显像

D．超声心动图

The development of e-commerce may well bring the world into a brand new era of "electronic currency". At the moment, (52) areas in Europe, the United States and Asia have already started studying the possibility of an electronic currency. Electronic currency is not only about currency. It (53) to an entire finance system on the Net. It includes a virtual numeric currency, an electronic system of withdrawals, transfers and loans, and (54) cards of all shapes and sizes. The (55) of an electronic currency system implies the emergence of "virtual banks" and "virtual enterprises". Actually, the first virtual bank appeared in the US in 1995. (56) it is a small and insignificant bank, it represents the trend of the future. In time to come, we may even have to (57) the familiar paper currency.

As the Net pushes the economy (58) rapidly, the economy is also bringing the Net market forward, resulting in the Internet itself becoming the world’s largest emerging market. Of course, this is just the beginning. Although there are many companies which made huge profits (59) in the Internet market, they tend to be small companies. To date, most companies are making losses. The competition in the knowledge-based economy will also be more (60) This will definitely promote (61) and more efficient cooperation.

57().

A.promote 

B.abandon 

C.encourage 

D.celebrate