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【单选题】
施工合同的合同工期是判定承包人提前或延误竣工的标准。订立合同时约定的合同工期概念应为，从（ ）的日历天数计算。A.
合同签字日起按投标文件中承诺
B.
合同签字日起按招标文件中要求
C.
合同约定的开工日起按投标文件中承诺
D.
合同约定的开工日起按招标文件中要求
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【单选题】已知某厂商生产某一数量的商品的平均成本是2美元，边际成本是2.50美元，平均成本是1.50美元，总不变成本是500美元。假定这种商品的价格是2美元并且不会被这家厂商所左右，那么根据最大利润原则，厂商应该( )
A.
增加产量。
B.
减少产量。
C.
停止生产。
【单选题】I______ ping pong quite well, but 1 haven't had time to play since the New Year.
A.
will play
B.
have played
C.
played
D.
play
【单选题】We ping-pong quite well, but we haven't had time to play it since the
A.
w year.
B.
will play
C.
play
D.
have played
【单选题】I ＿＿ ping-pong quite well, but I haven’t had time to play since the new year.
A.
will play
B.
have played
C.
played
D.
play
【单选题】I _____ Ping –pong quite well, but I haven’t had time to play since the new year.
A.
played
B.
will play
C.
have played
D.
play
【简答题】我乒乓球打得很好。 I Ping-Pong quite well.
【简答题】影视剧本的特点：影视剧本是______的结合、影视剧本是______的结合、影视剧本是______的结合、蒙太奇思维是影视剧作的构思和形式。
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