跨越架拆除附件安装完毕后,方可拆除跨越架。钢管、木质、毛竹跨越架应()逐根拆除,并应有人传递,不得抛扔。
A.自下而上
B.自上而下
C.上下同时
D.从左至右
参考答案:B
In 1492 Columbus and his crew arrived ______ was so-called the New World by the westerners.
A.in what
B.in which
C.what
D.where
如图18-5-22所示,矩形闸板AB,宽度1m,斜角度45°,则AB静水总压力的大小和作用点离C点的距离为()。
A.9.8kN、2.12m
B.13.86kN、2.12m
C.9.8kN、2.2m
D.13.86kN、2.2m