问题
单项选择题
测定缓、控释制剂释放度时，一般至少测几个取样点
A．1个取样点
B．2个取样点
C．3个取样点
D．4个取样点
E．5个取样点
答案
参考答案：C
解析：缓、控释制剂释放度测定取样点的要求。
搜题请搜索小程序“爱下问搜题”
测定缓、控释制剂释放度时，一般至少测几个取样点
A．1个取样点
B．2个取样点
C．3个取样点
D．4个取样点
E．5个取样点
参考答案：C
解析：缓、控释制剂释放度测定取样点的要求。
The Peppered Moth, a kind of insect(昆虫), is found in England. It is light brown in colour and likes to settle(栖息) on trees which are also light brown. This makes the moth difficult to be seen and birds are less likely to notice and eat it. But with the development of industry(工业) , smoke from factories began to reach the trees where the moth settled. It made the trees blacker. Then something very strange took place: in industrial areas, the Peppered Moth began to change colour. It became darker as well. Though the change took several years, some scientists soon notice that newly-born moths were a little darker than usual. A scientist with the name Kettlewell decided to make a careful study of this phenomenon(现象). He marked some of the light moths and some of the darker ones, and set them free in the woods near Bermingham, an industrial city. Later, he recaptured(重新捕获) as many as the marked moths as possible. The results were as follows.
Can you imagine what would happen to the Peppered Moth as the air became cleaner again? 小题1:The Peppered Moth began to change its colour in industrial areas because .
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