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【单选题】
根据《城镇燃气设计规范》GB50028规定，以下关于地下燃气管道埋设的最小覆土厚度(管道至地面)的说法中，错误的是()。A.
埋设于机动车道下时不得小于0.9m
B.
埋设于非机动车道下时不得小于0.3m
C.
埋设于水田下时，不得小于0.8m
D.
埋设于机动车不能到达的地方比如庭院下不得小于0.3m
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【简答题】编制一个 shell 脚本,实现( n+1 ) ! 运算。
【单选题】In terms of real sector activity, world trade in goods and services ________________.
A.
is important only to developed economies
B.
is important only to developing economies
C.
is important to both developed and developing economies
D.
is important to neither developed nor developing economies
【单选题】The PIN becomes blocked if the PIN code is entered incorrectly several times when operating capsat F77 MES. The maximum of input is _____.
A.
4.0
B.
5.0
C.
6.0
D.
3.0
【判断题】CRM databases can be analyzed in terms of a customer's activity over the life of the business relationship.
A.
正确
B.
错误
【单选题】The PIN becomes blocked if the PIN code is entered incorrectly several times when operating capsat F77 MES. The maximum of input is _____.
A.
4
B.
5
C.
6
D.
3
【简答题】机器,机构,零件,构件的关系 构成 构成 构成
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