搜题请搜索小程序“爱下问搜题”
问题 单项选择题 A1/A2型题

患者，男，45岁。体检发现左肺下叶有一小块阴影，直径约2.0cm，密度不均，边缘模糊；CT片呈分叶状，边缘有短细毛刺，考虑为（）

A.肺结核球

B.周围型肺癌

C.错构瘤

D.球形肺炎

E.硅肺结节

答案

参考答案：B

判断题

就其走上资本主义道路的方式看，日本和俄国是相类似的。[     ]
查看答案
单项选择题


As viewed from space, the Earth’s distinguishing characteristics are its blue waters and white clouds. Enveloped by an ocean of air consisting of 78% nitrogen and 21% oxygen, the planet is the only one in our solar system known to harbor life. Circling the Sun at an average distance of 149 million km (93 million miles), the Earth is the third planet from the Sun and the fifth largest planet in the solar system. Its rapid and molten nickel-iron core give rise to an extensive magnetic field which, coupled with the atmosphere, shields us from nearly all of the harmful radiation coming from the Sun and other stars. Most meteors burn up in the Earth’s atmosphere before they can strike the surface. The planet’s active geological processes have left no evidence of the ancient pelting it almost certainly received soon after it was formed. The Earth has a single natural satellite-the Moon.

Approximately how much of the Earth’s atmosphere is nitrogen

A．One-fourth

B．One-half

C．Three-fourths

D．All of it
查看答案