证券经纪商必须承担的义务体现了( )的具体原则。A．坚持信誉为本、客户至上 B．坚

13岁女孩。体型矮小， * * 尚未发育，无腋毛、阴毛；主动脉瓣听诊区可闻及3级收缩期杂音，双 * * 间距较宽，有颈蹼，后发际低，体表多痣。临床诊断拟诊Turner综合征，为了确诊和进行治疗，应检测的项目是

A．骨龄摄片

B．血清促性腺激素测定

C．染色体核型分析

D．B超盆腔扫描

E．胸部X线拍片

将下列主动语态变成被动语态。

1. We must finish the work in two days.

    The work must _____ in two days.

2. Mrs. Green has given Robert a present for Christmas.

    Robert _____ a present for Christmas.

3. We have used paper and printing for ages.

    Paper and printing _____ for ages.

4. He doesn't think computers can replace books.

    He doesn't think books _____ by computers.

5. We have bought some gifts for the poor children.

    Some gifts _____ for the poor children.

报关员获得从业资格的先决条件是：

A．参加报关员全国统一考试，考试合格并依法取得报关员资格证书

B．报关员受聘于一家报关单位，由所属报关单位以单位的名义为其申请办理报关员注册登记

C．经海关审核给予办理注册登记手续

D．经海关审核准子注册并颁发报关员证

伊红-Y0.5～1g、蒸馏水100ml。（）

A.水溶性伊红

B.Harris苏木精

C.Gill改良苏木精

D.Mayer苏木精

E.乙醇伊红液

直流中间电路的构成和作用是什么？