支气管哮喘的临床症状主要是（） A.吸气性呼吸困难 B.反复发作_爱下问搜题

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问题单项选择题

支气管哮喘的临床症状主要是（）

A.吸气性呼吸困难

B.反复发作，阵发性，呼气性呼吸困难

C.反复发作，混合性呼吸困难

D.夜间阵发性呼吸困难

E.肺部有较多的哮鸣音

答案

参考答案：B

多项选择题

精密仪器着火时，可以使用下列（）灭火器灭火。

A.四氯化碳灭火器

B.1211和二氧化碳灭火器

C.用水或泡沫灭火器

D.沙土

单项选择题

76． (1) is a channel’s capacity which directly reflects the data transfer rate of the channe1.
(2) functions in a NetWare network which is used to define addressing schemes.
(3) is a network layer device that supports multiple LAN interfaces and segments LANs into smaller collision and broadcast domains.
(4) is the popular LAN developed under the direction of the IEEE802.3.
(5) is a device which enables digital microcomputers to communicate across analog telephone lines.

(4)

A．Token Ring

B．Token Bus

C．Ethernet

D．FDDI