关于TCP和UDP，以下说法正确的是A．TCP和UDP都是端到端的传输协议 B．TC

根据句意、首字母或汉语提示填空。

1. Carrie will give a s______ in front of all her classmates.

2. She always feels n______ when she speaks in public.

3. —Don't make so much n______. Your father is sleeping.

4. It's ______ (正常的) for us to have these bad feelings, because everyone can't be happy all the time.

5. Ann is a ______ (陌生人) in the big city, so she has no friends. She feels very lonely.

如图所示梁的剪力方程应分几段来表述（）？

A.4

B.3

C.2

D.5

请画出常一线详细流程（包括阀门，设备编号，扫线汽，放空点，跨线阀）。

同心集成式注水管柱的第（）级封隔器是层间封隔器。

A、一

B、二

C、三

D、四