皮皮学，免费搜题
登录
搜题
【判断题】
保守力做正功时,系统内相应的势能增加 。A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】The paintings that have been found on the walls of nomadic dwelling-places _____.
A.
have taught historians something about the nomadic way of life
B.
have no other content than their artistic merit
C.
are not thought to be connected with an ancient calendar system
D.
are invariably accompanied by odd dots, lines and symbols
【单选题】Employees at Google spend one day a week working on their own ideas. This is an example of a ________________.
A.
planned initiative
B.
strategic initiative
C.
product-oriented strategy
D.
consumer-oriented strategy
相关题目：