________ that saw the rise of quite a number of new writers.

A．During the first half of the 18th century

B．That it was in the first half of the 18th century

C．It was in the first half of the 18th century

D．It was the first half of the 18th century

在发电机空负荷运行时，自动励磁调节的调压速度，应不大于发电机额定电压1%/s，不小于发电机额定电压0.3%/s。