28岁初孕妇，妊娠34周，自觉头痛眼花一周，经治疗5日未见显效。今晨4时突然出现腹痛

胸外心脏按压的正确部位是

A．胸骨下1/2

B．胸骨左侧第四肋骨间

C．胸骨上中2/3交接处

D．胸骨中下1/3交接处

E．胸骨左缘第四肋间腋中线上

下列属于国内信用保险的是（）。

A.个人贷款信用保险

B.投资保险

C.出口保险

D.国内保险

帆船所装设的电气号灯的垂直光弧，应在水平上方5度到水平下方5度内达到最低的发光强度；从水平上方25度到水平下方25度应保持最低发光强度的（）%。

A.50

B.60

C.40

D.70

(1) In the strength of the carrier signal is varied to represent binary 1 or 0.

(2) is a system that can map a name to an address and conversely an address to an name.

(3) is a three-way handshaking authentication protocol that it’s packets are encapsulated in the point-to-point protocol

(4) is an approach that enables an ATM Switch to behave like a LAN switch.

(5) is an guided media which is made of glass or plastic and transmits signals in the form of light.

2（）

A．NAT

B．NCP

C．DDN

D．DNS