题目内容

目前PLC继电器输出方式只能是直流负载。（）

A. 对
B. 错

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可编程控制器的输出有三种形式：一种是晶闸管输出、一种是继电器输出、晶体管输出。（）

A. 对
B. 错

Wefindyourterms___andnowsendourorderfor3setsofGenerators.

A. satisfied
B. satisfaction
C. satisfactory
D. ofsatisfaction

___heavycommitments,wecannotacceptanyfreshorders.

A. Owingto
B. Since
C. because
D. Inaddition

Wecanhardly_anyagreementwithyousinceyourcounter-offeris_tous.

A. reach,accepted
B. reach,unacceptable
C. arrive,accepting
D. arrive,acceptable