搜题请搜索小程序“爱下问搜题”
问题 单项选择题

《煤矿矿长保护矿工生命安全七条规定》中要求，必须保证井下机电和所有提升设备完好，严禁（）设备违规入井。

A.非隔热、非防水

B.非阻燃、非防水

C.非阻燃、非防爆

答案

参考答案：C

单项选择题

An 8-month-old boy is admitted to the pediatric unit following a fall from his high chair. The child is awake, alert, and crying. The nurse should know that a brain injury is more severe in children because of （）.

A．increased myelination.

B．intracranial hypotension.

C．cerebral hyperemia.

D．a slightly thicker cranium.
查看答案
单项选择题

慢性单纯性牙周炎表现为

A．根尖周多囊性透射区
B．根尖周弥散性透影区、边缘不整齐
C．根尖周边界清晰的阻射线
D．牙槽骨破坏、硬板消失、骨小梁变细、牙周间隙增宽
E．根尖周有圆形或椭圆形的边界清晰的透影区
查看答案