【多选题】焊接电流过大,飞溅和烟雾较大,焊条药皮易发红和脱落,且易产生( )等缺陷。
【单选题】以下哪一项需要基于悲观、乐观、预计期限的加权平均值来估计完成任务的时间?
【多选题】关公在全国影响深远,关帝庙数量众多,其中与“头枕洛阳、身卧当阳、魂归解州”有关的省份是( )
【单选题】Why did man have to track his target at a close range when using a short bow?
A.
Because it was too heavy.
B.
Because it did not bend easily.
C.
Because it did not shoot far.
D.
Because its string was short.