工程中许多构件在工作时出现随时间而交替变化的应力,这种应力称为()。
A.交变应力
B.平均应力
C.弯曲应力
D.剪切应力
参考答案:A
单句语法填空,每空只填一词
小题1:The settlement is home to nearly 1, 000 people, many of left their village homes for a better life in the city.
小题2:To stay awake, he finished a cup of coffee and ordered .
小题3:The church tower which _______ _______ (restore) will be open to tourists soon. The work is almost finished.
小题4:My uncle hesitated for a long time _______ he decided to buy a flat, as he was not quite sure whether the price of the house would go up or not.
小题5:Different methods to touch the keys will result _______ different display of the color.
社会主义道德建设的原则是.
A. * * 主义
B.集体主义
C.己所不欲,勿施于人
D.尊重个性