牙源性钙化上皮瘤的病理特征是()
A.具有成釉器样结构
B.具有导管样或花瓣样结构
C.具有成釉器样结构并有影细胞
D.肿瘤细胞核浓染并异型,细胞间桥明显
E.具有浸润性
参考答案:D
Those lovely flowers were ______ for your mother for her 57th birthday, but as she is away, I would be glad if you accept them.
A.committed
B.intended
C.supplied
D.scheduled
阀门壳体试验压力应为阀门()压力的1.5倍。
A、最高操作
B、正常操作
C、公称