搜题请搜索小程序“爱下问搜题”
问题 单项选择题 A1/A2型题

下列细胞中不具有有丝分裂能力的是（）

A.早幼粒细胞

B.中幼粒细胞

C.晚幼粒细胞

D.中幼红细胞

E.早幼红细胞

答案

参考答案：C

解析：原红细胞、早幼、中幼红细胞，都具有分裂能力，晚幼红细胞则已丧失分裂能力。

单项选择题

DOM is a platform- and language- （66） API that allows programs and scripts to dynamically access and update the content, structure and style of WWW documents (currently, definitions for HTML and XML documents are part of the specification).The document can be further processed and the results of that processing can be incorporated back into the presented （67） . DOM is a （68） -based API to documents, which requires the whole document to be represented in （69） while processing it. A simpler alternative to DOM is the event-based SAX, which can be used to process very large （70） documents that do not fit into the memory available for processing.

A．text

B．image

C．page

D． graphic
查看答案
单项选择题

引起牙髓炎最常见的疾病是

A．深龋
B．牙外伤
C．牙陷裂
D．楔状缺损
E．牙周炎
查看答案