排水横管不宜过长,一般不超过()m,且应尽量少转弯,有一定坡度,以保证水流畅通。
A.5
B.10
C.15
D.20
参考答案:B
课文填空
…For example, one evening __1___ it was so warm, I __2___ awake on purpose __3___ half past
eleven in order to have a good look at the moon by myself.
__4___ in the next century, people from England made __5___ to conquer other parts of the world
and because of that, English began to be spoken in many other countries.
继电保护装置做传动试验或一次通电时,应通知值班员和有关人员,并由()到现场监护,方可进行。
A、值班员
B、值长
C、工作负责人