皮皮学，免费搜题
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【多选题】
ABB工业机器人标准IO板常用的信号有A.
数字量输入信号DI
B.
数字量输出信号DO
C.
模拟量输入信号AI
D.
模拟量输出信号AO
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皮皮学刷刷变学霸
举一反三
【单选题】_________________, they had to take the taxi.
A.
There was no buses
B.
There being no buses
C.
There were no buses
D.
There are no buses
【单选题】______ no bus, we had to take a taxi to go to the station.
A.
There was
B.
There to be
C.
There had been
D.
There being
【单选题】_____, we had to take a taxi.
A.
There being no buses
B.
There been no buses
C.
No buses
D.
There being buses
【简答题】数据库文件中,主数据文件的扩展名是 _________ 、事务日志文件的扩展名是 _________ 。
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