电视剧《四世同堂》是根据现代作家（）的同名小说改编而成的。
A. 沈从文
B. 巴金
C. 老舍
D. 茅盾
为节约用料，排料时无需考虑面料的丝绺，只要做到排料紧奏即可。
A. 正确
B. 错误
绝缘子的预防性试验要求，35kV及以下的支柱绝缘子的绝缘电阻值，应不低于（）
A. 100MΩ
B. 300MΩ
C. 500MΩ
D. 1000M&Omega
In order to enhance worker productivity， a Cisco wireless network has been implemented at all locations. Which three statements regarding WLAN are true？（）
A WLAN client will operate in half-duplex mode.
B. The Aironet 1230 access point is an example of an access point that operates solely as a lightweight access point.
C. Ad hoc mode allows mobile clients to connect directly without an intermediate A
D. WLANs are designed to share the medium and can easily handle an increased demand of channel contention.
E. A lightweight AP receives control and configuration from a WLAN controller to which it is associated.
F. Another term for infrastructure mode is independent service set （IBSS）.
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