题目内容

删除和清除缓存的方法为wx.clearStorage(Object object)，用于清理本地数据缓存。

A. 对
B. 错

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网络连接分为监听网络状态变化事件和获取网络类型两个方法。

A. 对
B. 错

Botany, the study of plants, has a highly valued position in the history of human knowledge. From what we have1)____of preindustrial (工业化以前的) societies, a detailed study of plants must have been pretty ancient. Plants are the2)_of food for all living things, even for some other plants. They have always been3)important to human beings, not only for food, but also for clothing, weapons, tools, medicines, shelter, and many other4). People who lived in the jungle of the Amazon can recognize a wide5)of plants and know their properties. To them, botany has no name and is probably not even recognized as a special branch of “knowledge” at all.However,6), the more industrialized we become, the farther away we move from direct contact with plants. Now not many people have a reasonable7)of botanical knowledge. About10,000 years ago, when our ancestors8)_that certain grasses could be harvested and their seeds could be planted the next season, the9)between plants and humans was formed. As a result crops were10)__. From then on, humans live on the production of plants.

机床夹具都由哪些部分组成？

对定位元件的要求？