宽带无线接入技术是各种有线接入技术强有力的竞争对手，在高速因特网接入、双向数据通信、双向多媒体服务和视频广播等领域具有广泛的应用前景。
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I just received a proposal（）
A. that you have finalized the delivery dates.
B. to be more flexible over terms of payment.
C. that is made with certain conditions.
D. that could benefit both of us.
采暖系统按采暖的范围主要有（）。
A. 局部、集中、区域、单户采暖系统
B. 集中采暖系统
C. 局部、集中采暖系统
D. 区域采暖系统
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