零线()的偏差为负。
A.以上
B.以外
C.以内
D.以下
参考答案:D
拱桥荷载试验工况一般应选取______。 ①拱顶最大正弯矩;②拱顶最大负弯矩;③拱脚最大正弯矩;④拱脚最大负弯矩
A.①③ B.②④ C.①④ D.①②③④
Every minute is made full of our lessons well.
A.to use, study
B.use, studying
C.use, to study
D.used, studying