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问题 单项选择题

喷雾0.8%的过氧乙酸水溶液每立方米20～40ml，常温下作用多长时间，对室内物体表面上类炭疽杆菌芽孢杀灭率可达99.99%（）

A.30分钟

B.40分钟

C.50分钟

D.60分钟

E.90分钟

答案

参考答案：D

单项选择题

A Bluetooth device can be either a master or a slave and any of the devices within a (1) can be the master. There is only one master and there can be up to (2) active slave devices at a time within a single network. In addition, a device may be a standby slave or a parked slave. There can be up to (3) parked slaves. If there are already maximum number of active slaves, then a parked slave must wait until one of the active slaves switches to (4) mode before it can become active. Within a network, all (5) communications are prohibited.

5（）

A．master-to-master

B．master-to-slave

C．slave-to-slave

D．slave-to-master
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选择题

随着社会主义市场经济的发展，资本市场越来越活跃，也进一步拓宽了人们投资的渠道。对于居民通过存款、债券、股票等投资方式获得的收入，以下认识正确的是  [ ]

①是资本要素创造价值的结果 ②是按生产要素分配的收入  ③是合法的非劳动收入 ④是家庭财产性收入

A．①②③

B．①③④

C．②③④

D．①②④  
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