皮皮学，免费搜题
登录
搜题
【单选题】
某新生儿出生后不久出现进行性呼吸困难、缺氧。诊断为新生儿呼吸窘迫综合征，其起病的主要原因是A.
肺表面活性物质缺乏
B.
支气管痉挛
C.
肺纤维增生
D.
呼吸中枢发育不全
E.
气道阻塞
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Gold which is 10 Karats m proportion
A.
represents the highest grade of gold in the U.S.
B.
cannot be sold in the U.S.
C.
never carries a Karat quality mark.
D.
represents the lowest-grade gold marketable in the U.S.
【简答题】CPU是CNC装置的核心，它由运算器和控制器两个部分组成，运算器是对数据进行算术和逻辑运算的部件，（）是统一指挥和控制数控系统各部件的中央机构。
【简答题】Grade inflation—the gradual increase in average GPAs (grade-point averages) over the past few decades—is often considered a product of a consumer era in higher education, in which students are treated...
【单选题】Gold which is 10 Karats in proportion ______ in the U.S.
A.
represents the highest grade of gold
B.
cannot be sold
C.
never carries a Karat quality mark
D.
represents the lowest-grade gold marketable
【简答题】钠水玻璃砂的基本配比是什么？水玻璃砂的优缺点是什么？
【简答题】I no longer consider the grade-three thinking unimportant because nine-tenths of the people can be categorized into this grade and it is the highest grade they can reach in thinking.
相关题目：