方形系数计算公式CB=▽/L•B•X中X应为()
A、最小型深的85%
B、计算型深
C、计算型深的85%
D、最小型深
参考答案:A
He commanded the students ______ the classroom before he returned.
A.did not leave
B.leave not
C.not to leave
D.not leaving
未经值班调度人员许可,()不得操作电网调度机构调度管辖范围内的设备。