当耐张段长度超过800m时,一个耐张段内供电线接头的总数量安全值为()。
A、0个
B、2个
C、4个
D、8个
参考答案:C
________, the gathering crowd burst into applause.
A.On entering the hall
B.When he took the floor
C.The speaker took his place
D.No sooner had the speaker entered
根据轴颈和轴承之间的配合性质不同,轴承可分为滑动轴承和滚动轴承两类。