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【单选题】
某砂子表观密度为 2.50g/cm3 ,堆积密度为 1500kg/m3 ,则该砂子的空隙率为( )。A.
60%
B.
50%
C.
40%
D.
30%
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反馈参考答案：
举一反三
【单选题】遗传密码的摆动性是指 。()
A.
一种密码可以与第三位碱基不同的反密码配对
B.
一种反密码可与第一位碱基不同的几种密码配对
C.
反密码的第三位碱基与密码的第一位碱基不严格配对
D.
一种密码可与第一位碱基不同的反密码配对
【单选题】“我翻开历史一查,这历史没有年代,歪歪斜斜的每页上都写着“仁义道德”几个字”。这句话出自鲁迅作品( )。
A.
铸剑
B.
狂人日记
C.
从百草园到三味书屋
D.
阿Q正传
【单选题】邓小平多次指出,在改革中,我们必须坚持的社会主义根本原则是( )。
A.
不断发展生产，增加社会财富
B.
实行按劳分配，改善人民生活
C.
扩大改革开放，增强综合国力
D.
坚持公有制为主体，实现共同富裕
【单选题】A 31-year-old man experienced chest pain, became increasingly dyspneic and nauseated, and lost consciousness multiple times. Seven days after the appearance of these symptoms, he was found dead in his...
A.
Coronary atherosclerosis
B.
Dilated cardiomyopathy
C.
Disseminated tuberculosis
D.
Systemic sclerosis
E.
Malignant melanoma
F.
Marfan syndrome
G.
Takayasu arteritis
【单选题】A 33-year-old woman had increasing dyspnea with cough for the past 10 years. Over the past 2 days, her cough has become productive of chunks of gelatinous sputum. And she has been choked and died. The...
A.
Centriacinar emphysema
B.
Panacinar emphysema
C.
Chronic bronchitis
D.
Asthma
【单选题】A 25-year-old man was found dead at home by the apartment manager, who had been called by the decedent’s employer because of failure to report to work for the past 3 days. An external examination by ...
A.
Elevated anti–streptolysin O titer
B.
Positive ANCA serology
C.
Increased creatine kinase–MB (CK-MB) fraction
D.
High double-stranded DNA autoantibody titer
E.
Positive blood culture for Staphylococcus aureus
【简答题】【图片】图，一杆水平放置，且可饶O轴旋转，初始静止，现有一子弹垂直射向杆的底端，已知杆的质量为12千克，杆长2米，子弹质量4千克，速度为10米每秒，碰撞后子弹和杆粘在一起共同绕O轴转动，则他们一起的角动量为（ ）
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