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【单选题】
They ___________to put their hearts into study..A.
have made their minds
B.
have made their mind
C.
have made up their minds
D.
have made up their mind
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【简答题】studies werve for delight, for ornament, and for ability. Their chief use for delight is in rpivateness and retiring; for ornament, is in discourse; and for ability, is in the dudgment and disposition...
【简答题】A．He has decided to continue his studies. B．He has still to make a decision. C．He has decided to give up his job. D．He has still to take a part-time job.
【单选题】( )能驱动交直流负载和( )只能驱动交流负载
A.
晶体管型 、 继电器型 、晶闸管型
B.
继电器型、晶体管型 、晶闸管型
C.
晶体管型 、晶闸管型、继电器型
D.
继电器型、 晶闸管型、晶体管型
【单选题】23 Feasibility studies occur in which life cycle phase (s)?
A.
Conceptual
B.
Conceptual or Development
C.
Execution
D.
Preliminary planning
E.
any life cycle phase
【简答题】达摩面壁属于四种传播类型中的
【简答题】常用的开关量输出接口按输出开关器件不同有三种类型:继电器输出 、晶体管输出和双向晶闸管输出,其中,( )可驱动交流或直流负载,( )只能驱动直流负载,( )只能驱动交流负载。
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