对非突触性化学传递的描述不正确的是
A. 不存在突触结构
B. 与效应器距离大
C. 作用时间长
D. 传递存在一对一的关系
According to the passage, what is one disadvantage of skyscrapers that have mirrored walls
A. The exterior surrounding air is heated.
B. The windows must be cleaned daily.
Construction time is increased.
D. Extra air-conditioning equipment is neede
在聚合酶链反应中使DNA得以扩增的是
A. TaqDNA聚合酶
B. 拓扑异构酶
C. 解链酶
D. 引物酶
女性,50岁,体检发现右乳腺外上象限肿物,直径约1cm,质硬,边界不清,皮肤表面稍有内陷。X线检查可见微小钙化。手术活检切除肿物,最可能的病理诊断是
A. 纤维腺瘤
B. 叶状肿瘤
C. 导管内乳头状瘤
D. 浸润性导管癌