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【单选题】
下列关于阶梯式分级速度控制模式描述不正确的是？A.
轨道被划分为若干固定区段
B.
不同区段有不同的最高限速
C.
以轨道电路为传输媒介
D.
信息双向传输
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【单选题】听力原文：What is it called if a letter of credit is issued for guarantee of performance rather than payment? (3)
A.
Back-to-back credit.
B.
Reciprocal credit.
C.
Documentary credit.
D.
Stand-by credit.
【单选题】172 Fixed-price and incentive-type contracts place responsibility for performance and financial risks associated with delay or non-performance on the:
A.
Buyer
B.
Third party
C.
Contractor
D.
All of the above
E.
None of the above
【单选题】A benefit performance is a performance for which a charitableorganization has bought out at a discounted price and _____ funds by sellingtickets at a full price.
A.
furnishes
B.
raises
C.
accumulates
D.
contributes
【简答题】performance-price ratio
【单选题】benefit performance is a performance for which a charitable organization has bought out at a discounted price and ___ funds by selling tickets at a full price.
A.
furnishes
B.
raises
C.
accumulates
D.
contributes
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