接触热阻

单项选择。

Can you            me where the computer is? [ ]

A. say

B. speak

C. write

D. show

石韦原植物所属的科是（）

A.小檗科

B.蓼科

C.十字花科

D.蔷薇科

E.豆科水龙骨科

在保险活动中，被保险人违反保证义务，但保证的事实是非重要的事实，保险人的正确处理方式是( )。

A．不承担赔偿或给付保险金的责任，但退还保险费
B．不承担赔偿或给付保险金的责任，不退还保险费
C．承担赔偿或给付保险金的责任
D．承担部分赔偿或给付保险金的责任

厚朴药材的鉴别特征是（）

A.迎光检视有闪烁的小亮点

B.内表面淡灰黄色有细纵纹，常见发亮的结晶

C.内表面紫棕色或深紫褐色，划之显油痕；质地坚硬，断面富油性，有时可见细小发亮的结晶

D.断面中间有一黄棕色线纹，内侧红棕色油润

E.断面有多条黄棕色线纹

A transport layer protocol has several responsibilities, One is to create a process-to-process (program-to-program) communication; TCP uses port （1） to accomplish this. Anotherresponsibility of a transport layer protocol is to create a（2）and error-control mechanism atthe transport level. TCP uses a sliding（3）protocol to achieve flow control. It uses theacknowledgment packet, time-out, and retransmission to achieve （4） control. The transportlayer is also responsible for providing a connection mechanism for the application program. Theapplication program sends （5）of data to the transport layer. It is the responsibility of thetransport layer at the sending station to make a connection with the receiver.

（5）是（）

A.ports

B.streams

C.packets

D.cells