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问题 单项选择题

与人肾小球基底膜具有共同抗原（）

A．大肠杆菌O14

B．溶血性链球菌

C．变形杆菌OX19

D．大肠杆菌O86

E．肺炎球菌14型

答案

参考答案：B

选择题
While building a tunnel through the mountain, ______ ．
　 
A．an underground lake was discovered
　		B．there was an underground lake discovered
　		C．the workers discovered an underground lake
D．a lake was discovered underground
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单项选择题

如果马道的宽度大于（）m时，才应在小横杆中间加绑吊杆。

A.1.2

B.1.5

C.2

D.3
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