I went to a restaurant _________ my parents.[ ]
A. and
B. with
答案:B
图示四个悬臂梁中挠曲线是圆弧的为:().
A.A
B.B
C.C
D.D
椿象的翅为()
A.鳞翅
B.膜翅
C.复翅
D.半鞘翅