EPROM是 (29) ，计算机内存主要由 (30) 导体存储器构成。 A．只读存储

病历摘要：患者，男性，36岁，因“皮肤紫纹伴头痛2月”来诊，2月前患者无明显诱因出现皮肤紫纹，见于背部、双侧腹股沟，未见皮肤破损溃烂，伴头痛，多见于激动时，无头晕、恶心、呕吐。既往体健，无长期服药史。体检：身高162cm，体重80kg，血压145/95mmHg。

如果为了鉴别肾上腺皮质增生和肾上腺腺瘤，下列哪项检查最有价值？（）

A.血皮质醇

B.血钾

C.血钠

D.尿钾

E.尿钠

F.大剂量地塞米松抑制试验

电路两端电压不变，当电阻增至30Ω时电流降为原来的4／5，则电路原来的电阻为_______Ω。

根据对话内容，在空白处填写适当的话语（话语可能是一个句子，也可能是一个短语或一个词），使对话完整。

A: Ann's birthday is coming.  I need to-get some money to buy her a present. __1__?

B: If l were you,  1 would ask my parents for some money.

A: No, __2__.  I don't want to make them unhappy because they don't want me to make friends at school.

B: __3__ borrowing some from your friends?

A: No. They don't have any money, either.

B: Go to your uncle and help him sell clothes.  Maybe he would like to give you somc.

A: __4__ I'll try that.

B: What would you like to buy?

A: Maybe a scarf and some flowers.

B: Now flowers are very expensive, you know.

A: But she __5__ flowers, especially roses. I'll  have to buy her some roses.  I must go now.  I have to

    go to see my uncle.

B: See you.

Those____are very good.    [ ]

A. boxs        

B. boy    

C. boxes      

D. boies

下列说法不正确的选项是()。

A.普通股的发行成本通常低于留存收益的成本

B.市场利率上升，会导致公司债务成本的上升

C.根据资本资产定价模型可以看出，市场风险溢价会影响股权成本

D.税率变化能影响税后债务成本以及公司加权平均资本成本