5.当指北针的磁针静止后,其N端(通常都有标志)所指的方向即为北方。
查看答案
4.我国南方的许多树木树干的断面可见清晰的年轮,向北一侧的年轮较为疏稀,向北一侧则年轮较紧密。
A. 对
B. 错
2.遇到较倾斜的下坡道时,最重要的是脚要采用 “外八字”步走,即脚尖向外沿坡度侧方向打开。
A. 对
B. 错
1.行进中的呼吸,要着重吐气,把肺腔的气全部呼出,腹腔的呼吸肌自然会进行深呼吸,吸入更多的空气和氧分。
A. 对
B. 错
Castles were built in places where they could be easily 1) ____________. A position on high ground 2)____________ the defenders with a view of the 3)____________ countryside, making attacks more difficult. In 4) ____________ areas, castles were surrounded by a 5) ____________ moat.