X射线机房应有足够的使用面积。新建X射线机房,单管头200mAX射线房不应小于(),双管头的不应小于()。
参考答案:
4m2;36m2
There was a hole in the door, through which I __________ sight of Mr. Brown sitting in a chair. [ ]
A. caught
B. made
C. took
D. got
苍蝇和蚊子属于()。
A、双翅目
B、膜翅目
C、鞘翅目
D、鳞翅目