皮皮学，免费搜题
登录
搜题
【判断题】
数控机床故障时,应立即拍下急停按钮而不是立即切断电源。( )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
【简答题】Natural ways of keeping time In ancient times, people had to use the sun and the moon to tell time. They got up when the sun came up and worked in the fields until the sun went down. Man-made things T...
【单选题】How did the sea serve the needs of man in ancient times?
A.
By providing oil for them.
B.
By giving them space.
C.
By providing food for them.
D.
By giving them hope.
【单选题】In ancient Egyptian paintings, royal figures were differentiated by making them several times larger man other.
A.
distinguished
B.
estranged
C.
deferred
D.
enlarged
【简答题】In ancient times man did not know how to explain the difference ____gases, solids and liquids. (among, amid, between)
相关题目：