搜题请搜索小程序“爱下问搜题”
问题 选择题

A: I need _____. Where are they?

B: On the desk.[ ]

A. some ruler

B. a pens

C. two pencils

D. three map

答案

答案：C

单项选择题

人体某些组织成像时，缺乏组织间影像的自然对比(如肝组织与胃肠道)，人为地在体内给予某种物质来增加组织间影像的对比度，以扩大诊断范围和提高诊断准确性，这种方法称为人工对比法，所用的物质称为对比剂。

关于对比剂的叙述正确的是

A．硫酸钡是阴性对比剂

B．硫酸钡含酸味

C．硫酸钡应避光保存

D．无机碘不良反应少

E．二氧化碳是阴性对比剂
查看答案
填空题

You want to know what the safest place for children 77．______
is in the car The experts say the back seat is the safest for 78．______
them. The back seat is farthest away off the force of a head- 79．______
on collision(迎头撞击), which can lead serious injuries. 80．______
If your child is below 8 and weighs no more than 85 81．______
pounds, it is necessarily to fit your car with a safety seat. 82．______
Moreover, the safety seat must be held in place of on the83．______
car’s back seat. If your child do need your attention while 84．______
you driving, don’t look back with only one hand on the 85．______
wheel. You’d better stop the car. 86．______
查看答案