哪项不是CR摄像的优点（） A.实现常规X线摄影信息数字化 B.提高图像密度分辨力

保险人向投保人签发的保险单或者其他保险凭证，应加盖()

A.保险公司公章

B.经授权出单的分支机构公章

C.法定代表人、负责人名章

D.内部职能部门印章

转移训练过程中，以下角度错误的是（）。

A、偏瘫患者在独立由坐位进出浴盆时，患者驱动轮椅与浴盆成45度角

B、四肢瘫患者在床与轮椅之间转移时与床成20——30度角

C、截瘫患者在轮椅与座椅之间的转移训练时，两椅互成60度角

D、截瘫患者独立由轮椅到浴盆的侧方转移（从右侧转移）时，轮椅从右侧接近浴盆，与浴盆成60度角

E、截瘫患者从床到轮椅的转移时需卸下近侧挡板

由唐至清斗棋的尺度、疏密程度的变化是()。

A、由大到小到密

B、由大到小到疏

C、由小到大到疏

D、由小到大到密

Melissa and Love Letter made use of the trust that exists between friends or colleagues. Imagine receiving an (26) from a friend who asks you to open it. This is what happens with Melissa and several other similar email (27) . Upon running, such worms usually proceed to send themselves out to email addresses from the victim’s address book, previous emails, web pages (28) .
As administrators seek to block dangerous email attachments through the recognition of well-known (29) , 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 (30) access to your network.

A．virtual

B．virus

C．worms

D．bacteria

无锚点吊装技术的方法很多，它们本质的共同点在于利用（）的运动达到吊装工件就位的目的。

A、自平衡装置

B、自动装置

C、推杆

D、门架