皮皮学，免费搜题
登录
搜题
【简答题】
光与物质相互作用存在三种不同的基本过程，即光子的______、______和______。
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】When hoisting a boat on gravity type davits using an electric motor driven winch，the davit arms should be brought up（）.
A.
to their final position with the winch operating at slow speed
B.
to the bar stop，and then hand cranked to their final position
C.
until just before they make contact with the limit switch，and then hand cranked to their final position
D.
to the embarkation deck，and then hand cranked to their final position
【单选题】Electric cargo winches have an overload safety device which normally cuts the current to the winch motor（）.
A.
after torque cause line pull to exceed the rated capacity of the winch
B.
before the line pull reaches the rated capacity of the winch
C.
when the line pull reaches the breaking strengh of the fall
D.
before the safe working load of the fall is reached
相关题目：