My father, as well as my mother, __________ delicious food for me whenever I go back home from the university.
A. cook
B. cooks
C. cooked
D. cooking
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“He __________ to live in Dongguan” means that he no longer lives there.
A. uses
B. used
C. was used
D. is used
When __________ know each other? Ten days ago?
A. do you
B. did you
C. do you get to
D. did you get to
基本体系在Δ1=1单独作用时,附加约束2中产生的约束力矩和约束力为 ( ) 。
A. k11
B. k21
C. k22
位移法方程实质上是几何条件。( )
A. 对
B. 错