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【单选题】
以下关于招标文件说法正确的是A.
招标文件中可以指定使用特定品牌材料
B.
招标文件一定由招标人编写
C.
招标人澄清、修改招标文件需在投标截止之日前15天
D.
招标文件发出之日至投标文件截止之日不少于15天
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举一反三
【简答题】当关键字集合很大时,关键字值不同的元素可能会映象到哈希表的同一地址上,即 k1≠k2 ,但 H(k1)=H(k2),这种现象称为____________。
【简答题】The ideal college would be a kind of educational retreat in which you could try to find yourself; find out what you like and want; what you are and are not good at.
【单选题】On modern ships, centrifugal pump with a self-primer has replaced reciprocating pump as bilge pump because（）
A.
centrifugal pump is cheaper than reciprocating pump
B.
the size of centrifugal pump with same capacity is smaller than that of reciprocating pump
C.
centrifugal pump makes maintenance easier than reciprocating pump does
D.
all of the above
【单选题】S1: What are the main kinds of pumps on board ship? S2: Besides the centrifugal pump, there are reciprocating pump, vane pump, gear pump and screw pump . Q:What kinds of pumps are there not mentioned ...
A.
Reciprocating
B.
Vane pump
C.
Gear pump
D.
Injection pump
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