以下选项中哪个特性不受等比缩放“Scale”命令的影响？（）A、用“PE”命令设置的

因数中一共有几位小数，积中也一定有几位小数．______．

飞机起飞的速度相对静止空气是60 m/s，航空母舰以20 m/s的速度向东航行，停在航空母舰上的飞机也向东起飞，飞机的加速度是4 m/s²，则起飞所需时间是         s，起飞跑道至少长         m

中国工程咨询协会的宗旨主要是( )。

A．遵守宪法、法律、法规和国家政策

B．竭诚为政府及有关各方和会员提供服务

C．积极反映工程咨询行业、会员的诉求

D．提高协会自身提供咨询服务的水平

E．努力规范工程咨询行为，促进工程咨询事业又好又快地可持续发展

A transport layer protocol usually has several responsibilities．One is to create a process-to-process communication；UDP uses (1) numbers to accomplish this．Another responsibility is to provide control mechanisms at the transport level．UDP does this task at a very minimal level．There is no flow control mechanism and there is no(2) for received packet．UDP, however, does provide error control to some extent．If UDP detects an error in the received packet，it will silently drop it． The transport layer also provides a connection mechanism for the processes．The (3) must be able to send streams of data to the transport layer．It is the responsibility of the transport layer at (4) station to make the connection with the receiver, chop the stream into transportable units，number them，and send them one by one．It is the responsibility of the transport layer at the receiving end to wait until all the different units belonging to the same process have arrived，check and pass those that are (5) free, and deliver them to the receiving process as a stream．

（1）处应填（）。

A．hop

B．port

C．route

D．packet

运行中引起高压加热器保护装置动作的唯一原因是加热器钢管泄漏。