双代号网络图有助于管理者集中精力抓住关键环节工作，确保工程进度满足计划工期要求。
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The speaker gave a speech at the same stage last year.
A. 对
B. 错
The water is a bit above zero degrees centigrade.
A. 对
B. 错
That swim took him more than 18 hours.
A. 对
B. 错
He decided not to swim in cold water again when hecame out of water.
A. 对
B. 错
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