【多选题】【消耗次数：1】
钙缺乏的症状有以下哪几点?
①
克汀病
②
骨质软化症
③
佝偻病
④
克山病
参考答案：
复制
纠错
相关题目
【单选题】
佝偻病的发生是由于缺乏（ ）．
①
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②
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③
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④
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随机题目
【单选题】
原点到直线<img src="20190809/1565320065373579.png" title="1565320065373579.png" alt="图片21.png"/>的距离为3，则m的值为（ ）
①
5
②
15
③
-15
④
±15
【单选题】
点（0，2）到直线<img src="20190809/1565320123974836.png" title="1565320123974836.png" alt="图片22.png"/>的距离为（ ）
①
2
②
3
③
4
④
1
【单选题】
直线<img src="20190809/1565320469784241.png" title="1565320469784241.png" alt="图片33.png"/>的斜率为（ ）
①
<img class="kfformula" src="20190809/1565320507335017.png" data-latex="\frac {1} {2}"/>
②
<img class="kfformula" src="20190809/1565320507148737.png" data-latex="-\frac {1} {2}"/>
③
<img class="kfformula" src="20190809/1565320507128594.png" data-latex="2"/>
④
<img class="kfformula" src="20190809/1565320507871509.png" data-latex="-2"/>
【单选题】
直线<img src="20190809/1565321125544656.png" title="1565321125544656.png" alt="图片43.png"/>与圆<img src="20190809/1565321148327721.png" title="1565321148327721.png" alt="图片44.png"/>的位置关系是（）
①
相离
②
相切
③
过圆心
④
相交不过圆心
【单选题】
已知点M（2,-1）、N（1，4）和直线 x＋2y－1＝0，则（ ）
①
M在直线上、N不在直线上
②
M不在直线上、N在直线上
③
M、N都不在直线上
④
M、N都在直线上
【单选题】
已知直线过点<img class="kfformula" src="20190809/1565321501439277.png" data-latex="\left ( {\sqrt {3}，-3} \right )"/>，且倾斜角为30°，则直线的方程是( )
①
<img src="20190809/1565321420131356.png" title="1565321420131356.png" alt="图片49.png"/>
②
<img src="20190809/1565321484569743.png" title="1565321484569743.png" alt="图片50.png"/>
③
<img src="20190809/1565321493966443.png" title="1565321493966443.png" alt="图片51.png"/>
④
<img src="20190809/1565321498657079.png" title="1565321498657079.png" alt="图片52.png"/>
【单选题】
下列哪一条直线和直线<img src="20190809/1565320201526987.png" title="1565320201526987.png" alt="图片23.png"/>垂直（ ）
①
<img src="20190809/1565320231265885.png" title="1565320231265885.png" alt="图片24.png"/>
②
<img src="20190809/1565320236985820.png" title="1565320236985820.png" alt="图片25.png"/>
③
<img src="20190809/1565320240932537.png" title="1565320240932537.png" alt="图片26.png"/>
④
<img src="20190809/1565320244810901.png" title="1565320244810901.png" alt="图片27.png"/>
【单选题】
下列哪一条直线和直线<img src="20190809/1565320280214095.png" title="1565320280214095.png" alt="图片28.png"/>平行（ ）
①
<img src="20190809/1565320330561884.png" title="1565320330561884.png" alt="图片29.png"/>
②
<img src="20190809/1565320342971883.png" title="1565320342971883.png" alt="图片30.png"/>
③
<img src="20190809/1565320351487163.png" title="1565320351487163.png" alt="图片32.png"/>
④
<img src="20190809/1565320355903162.png" title="1565320355903162.png" alt="图片31.png"/>