假定横梁在B点处用托板支座与柱连接(托板刨平顶紧)，梁的支座端板用C级普通螺栓(4.6级)与局部加厚的柱翼缘板相连，其螺栓布置如图梁柱栓接所示。试问应选用以下______项公称直径的螺栓方为正确？ 提示：连接处的弯矩设计值近似取B点的弯矩值，并假定中和轴在底排螺栓线上。

A．accuracy.

B．existence.

C．control.

D．completeness.

file.Certkiller .com has instructed you to change the hosts file if it has been changed.You, therefore, need to display the size and whether the hosts file is set to read-only.What should you do？（）

A.

B.

C.

D.

offered to you.()

此题为判断题(对，错)。

s offered to you.()

此题为判断题(对，错)。

A．File generation time

B．File generation size

C．File type

D．File attribute

ackets. The commission has yet to determine whether the information the firm has supplied will really ensure with Windows servers. (interoperate)

From the passage we know that ______.

A．virus scanners can identify a virus even if they don't have a signature for it

B．one of the weaknesses of the virus scanners is that they can't detect a known virus before it is executed

C．self mutating viruses which infect a file in a different way each time, can't be identified by a simple pattern search and therefore make the scanners ineffective

D．because virus scanners identify a virus by name, they can indicate only where on the hard driver infection has occurred

of current for normal brightness. Determine an appropriate value for the pull up resistor R when the LED is connected to a 74AC00 (two-input NAND) gates.