皮皮学，免费搜题
登录
搜题
【单选题】
正硼酸(H 3 BO 3 )是一种片层状结构的白色晶体，层内的H 3 BO 3 分子通过氢键相连（如图所示）。 下列有关说法中正确的是 [ ]A.
正硼酸晶体属于原子晶体
B.
H 3 BO 3 分子的稳定性与氢键有关
C.
分子中硼原子最外层为8电子稳定结构
D.
含1molH 3 BO 3 的晶体中有3mol氢键
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
【简答题】Because plants cannot move or talk, most people believe that they have no feelings and that they cannot receive signals from outside. However, this may not be completely true. People who studied plant...
【单选题】患者,男性,36岁,饱食后突感上腹部剧痛,迅即扩展至全腹,伴恶心、呕吐,呕吐后腹痛无减轻,发病2小时后来院急诊。体检:痛苦面容,血压85/50mmHg,P124次/分,全腹肌紧张,压痛、反跳痛,肠鸣音消失,白细胞16x109/L,中性粒细胞比例0:90,既往身体健康,无消化性溃疡史,有胆石症病史。该患者导致上述疾病的主要诱因为()
A.
急性外伤
B.
不洁饮食
C.
暴饮暴食和胆石症
D.
胆石症
E.
大量酗酒
【简答题】1 It is possible that hackers can ________ (remote) hack into your computer, bank account or even your house. 2 The ysis of hacks into credit accounts highlights the ________ (vulnerable) of passw...
【简答题】A shareholder of QSX Co is concerned about the recent performance of the company and has collected the following fi nancial information. One of the items discussed at a recent board meeting of QSX Co ...
【简答题】“Yes, ladies and gentlemen, welcome aboard NASA’s Space Elevator. We’re going to leave soon. The entire ride will take about five hours, so sit back and enjoy the trip. As we rise, be sure to look out...
相关题目：