ABSTRACT
Parasitism refers that some kind of organism lives inside another organism or its body surface for a long-term or temporarily, thereby obtaining nourishment to survive and forming a kind of interspecies relations that the other party is damaged but can’t immediately lead to the death. The former is a parasite, and the latter is a host of parasite also called parasitifer. In the parasitical relationship, parasite harms the host of parasite in a lot of aspects. Some parasites plundered the nutriments of the host, such as the pinworm and tapeworm parasitizing in human intestinal tract; some parasites damage the host tissues, such as the plasmodium parasitizing in the hemocyte; Some parasites also release toxins
1 INTRODUCTION
The number of medium, small and micro enterprises increased rapidly in recent years. The small and micro enterprises developed rapidly not only in the scale, especially in the obvious progress of efficiency. Medium, small and micro enterprises have the features of the largest number, most categories, the minimum threshold, the most extensive channels and the easiest employment, which provide more than 80% jobs in the cities and towns and become the main channel of the re-employment of rural surplus labor force and laid-off workers of state-owned enterprises and also the employment of college graduates. The effect of medium, small and micro enterprises as the main channel of employment has become more prominent.
