“坚持义渡”是湖北省一万姓人家祖上传下来的一个承诺。为此，万家祖孙四代人在一个渡

胚胎性横纹肌肉瘤（）

A.和表面上皮紧邻的细胞致密排列成生发层

B.空泡状核和明显的圆核仁的“蜘蛛”细胞

C.由圆形细胞构成，类似淋巴瘤

D.独特的球形、玻璃样、嗜酸性胞质内包涵体

E.由未分化圆形至梭形胞质明显嗜酸性的梭形、蝌蚪形、球拍样多形细胞混合构成

下列实验操作正确的是[ ]

A.

B.

C.

D.

把2千克苹果平均分给5个小朋友，每个小朋友分得______千克，每人得到全部苹果的______．

铁路稽查人员凭（）可以在车内验票。

A、工作证

B、稽查证件

C、稽查臂章

D、佩戴稽查臂章

E、客规

(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.

（55）是（）

A.X.25

B.ATM

C.FDDI

D.SMDS