搜题请搜索小程序“爱下问搜题”
问题 单项选择题

对公司而言，发行不同种类的公司债券有不同的限制条件，其中有公司债券不得随便增加、债券未清偿之前股东的分红要有限制等的是（　　）。

A．不动产抵押公司债

B．信用公司债

C．保证公司债

D．收益公司债

答案

参考答案：B

单项选择题 A1型题

金属烤瓷冠就位后色泽、形态与各牙协调，颈长达设计要求，颈部探针可探入，邻接处牙线勉强通过，正中时切端位于烤瓷区，你认为此冠（）。

A.为合格修复体

B.邻接过紧

C.邻接过松

D.金-瓷结合区设计不当

E.颈部与牙体间隙过大
查看答案
单项选择题

Melissa and LoveLetter made use of the trust that exists between friends or colleagues. Imagine receiving an (3) from a friend who asks you to open it. This is what happens with Melissa and several other similar email (4) . Upon running, such worms usually proceed to send themselves out to email addresses from the victim’s address book, previous emails, web pages (5) .

As administrators seek to block dangerous email attachments through the recognition of well-known (6) , virus writers use other extensions to circumvent such protection. Executable (.exe) files are renamed to .bat and .cmd plus a whole list of other extensions and will still run and successfully infect target users.Frequently, hackers try to penetrate networks by sending an attachment that looks like a flash movie, which, while displaying some cute animation, simultaneously runs commands in the background to steal your passwords and give the (7) access to your network.

5（）

A.memory 

B.caches 

C.ports 

D.registers
查看答案