关于纸片扩散法结果判断，下列叙述错误的是A.测量抑菌环直径用肉_爱下问搜题

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问题单项选择题

关于纸片扩散法结果判断，下列叙述错误的是

A.测量抑菌环直径用肉眼判读，包括纸片直径。保持平板在反射光照明的非反射黑的背景上方几英寸，肉眼观察无明显生长的地区作为抑菌环边缘。在抑菌环边缘借助放大镜才能观察到的微小菌落生长可忽略不计

B.由于培养基中可能存在拮抗剂，甲氧苄啶和磺胺类药物抑菌环内可允许出现菌株轻微生长。因此，在测量抑菌环直径时可忽视轻微生长(20%或较少的菌苔)而测量较明显抑制的边缘

C.变形杆菌可迁徙到某些抗菌药物抑菌环内生长，因此变形杆菌抑菌环内由于迁徙出现的淡淡云雾样生长可忽略不计

D.用纸片扩散法能可靠地测定分离于囊性纤维化患者的铜绿假单胞菌的敏感性，但在作为敏感结果报告前，应将培养时间延长至20h

E.葡萄球菌对利奈唑胺、苯唑西林、万古霉素结果应用透射光阅读

答案

参考答案：D

完形填空

In the past, man did not have to think about the protection of his environment. There were few people on the earth, and natural   36  seemed to be unlimited.
Today things are   37  . The world has become too   38  . We are   39  our natural resources too quickly, and at the same time we are   40  our environment with dangerous chemicals. If we   41  to do this, human life on earth will not   42 .
People realize today that if too many   43  are taken from the sea, there will soon be none left. Yet, with modern fishing   44  , more and more fish are caught.
We know that if too many trees are cut down,   45  will disappear and nothing will 46  on the land. Yet, we continue to use bigger and more powerful machines to   47  more and more trees.
We realize that if rivers are polluted with waste products from factories, we will die.   48  , in most countries waste products are still put into rivers or into the sea, and there are few laws to   49 this.
We also know that if the   50  of the world continues to rise at the present rate, in a few years, there won't be enough food. What can we do to solve the   51  ? If we eat more vegetables and less   52  , there will be more food available for everyone. Land that is used to grow crops feeds five times more people than land where animals are kept.
Our natural resources will   53   longer if we learn to recycle them. The world population will not   54  so quickly if people use modern methods of birth control.
Finally, if we   55  people to think about the problems we shall have a better and cleaner planet in the future.

C．Generally speaking

B．environment

单项选择题

石灰的主要成分是( )。

A．碳酸钙

B．氧化钙

C．氢氧化钙

D．碳化钙