【单选题】【消耗次数：1】
用两种方法检测住院患者痰中抗乳酸杆菌，甲法检查痰标本234份，阳性率30%，乙法检查108份，阳性率20% ，两法合并阳性率等于（ ）
①
30%＋20%
②
（30%＋20%）/2
③
（30%－20%）/2×200
④
（234×30%＋108×20%）/（234＋ 108）
⑤
（30%＋20%）/（234＋108）
参考答案：
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相关题目
【单选题】
随机选取男200人,女100人为某寄生虫病研究的调查对象,测得其感染阳性率分别为20%和15%，则合并阳性率为（ ）
①
35%
②
16.7%
③
18.3%
④
无法计算
【单选题】
已知四点A（10、20、30）、B（30、20、10）、C（10、20、10）、D（20、20、30），则对H面的重影点为______。
①
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
A与D，D点可见
②
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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B与C，B点可见
③
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
/* Style Definitions */
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A与C，A点可见
④
Normal
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7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
/* Style Definitions */
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A与C，C点可见
【单选题】
A点坐标为（10、20、30），B点坐标为（30、20、30）则AB距离为______。
①
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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正垂线
②
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
/* Style Definitions */
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侧垂线
③
Normal
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0
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false
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ZH-CN
X-NONE
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mso-hansi-theme-font:minor-latin;
mso-font-kerning:1.0pt;}
正平线
④
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
/* Style Definitions */
table.MsoNormalTable
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铅垂线
【单选题】
新冠病原学检查时，采集哪个位置的标本阳性率最高（ ）
【单选题】
付款条件：信用天数30天，优惠天数1是10天，优惠率1是2%，优惠天数2是20天，优惠率2是1%，以下哪种说法是对的（ ）。
①
2/10，1/20，n/30
②
1/10，2/20，n/30
③
2/10，2/20，n/30
④
3/10，1/20，n/30
【单选题】
已知A、B、C三点坐标分别为（10、20、30）（20、40、60）、（30、60、90），则A、B、C三点______。
①
Normal
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7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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表示一个平面
②
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
/* Style Definitions */
table.MsoNormalTable
{mso-style-name:普通表格;
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mso-hansi-font-family:等线;
mso-hansi-theme-font:minor-latin;
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不能表示一个平面
③
Normal
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false
false
false
EN-US
ZH-CN
X-NONE
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表示一个特殊位置平面
④
Normal
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X-NONE
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无法判断
随机题目
【单选题】
生杜仲临床应用较少，一般用于
①
人治疗肾虚腰痛，起坐不利，膝软乏力
②
治疗肝肾亏虚，胎动不安，妊娠漏血
③
浸泡药酒，制备治腰痛的杜仲酒
④
治中风筋脉挛急，腰膝酸软，筋骨无力
⑤
治高血压症