填写工作票时要字体规范，不得涂改和不得用()填写。
A. 钢笔
B. 圆珠笔
C. 铅笔
线绕式异步电动机串级调速有哪些优点？适用于什么场合？
A.Houses are much more quiet.B.Houses provide more privacy.C.They want to have more spa
A. Houses are much more quiet.
B. Houses provide more privacy.
C. They want to have more space.
D. They want a garden of their own.
世界上第一代PLC所在的年代是()，其特点主要为()。
A. 1973-1980，8位CPU.磁芯存储器
B. 1969-1972，1位CPU.磁芯存储器
C. 1981-1983，16位CPU.半导体存储器
D. 1968-1973，4位CPU.磁芯存储器
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