饮食稍有不慎，即有呕吐，时作时止，面色咣白，倦怠乏力，口干不欲饮，四肢不温，大便溏薄

电梯轿厢停于接近电梯口的位置时的援救步骤（）。

A.关闭机房电源开关

B.用专门外门锁钥匙开启外门

C.在轿厢顶用人力慢慢开启轿门

D.再打开机房电源开关

E.协助乘客离开

(51) is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication.
(52) is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.
(53) functions with two layers of protocols. It can connect networks of different speeds and can be adapted to an environment as it expands.
(54) is the popular LAN developed under the direction of the IEEE802.5.
(55) is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSI.

A．ISO

B．ANSI

C．CCIT

D．IEEE

发放股票股利的优点主要有______。

A．可以扩大股东权益

B．可以将现金留存公司用于追加投资，扩大企业经营

C．股票变现能力强，易流通，股东乐于接受

D．传递公司未来经营效益的信号

E．便于今后配股融通更多资金和刺激股价

施工合同的合同工期是判定承包人提前或延误竣工的标准，订立合同时约定的合同工期为，从（）的日历天数计算。

A、合同签字日起按投标文件中承诺

B、合同签字日起按招标文件中要求

C、合同约定的开工日起按投标文件中承诺

D、合同约定的开工日起按招标文件中要求

关于ACP面板上的PA键，以下叙述正确的是（）

A.用于驾驶员和服务员通话

B.按下后松开，键上的三个绿色的横线呈常亮

C.按下并保持住，实现旅客广播

D.按下后松开，实现旅客广播