皮皮学，免费搜题
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【单选题】
哪种滑油系统，供油量随发动机状态改变而改变？A.
调压活门式
B.
全流式
C.
消耗式
D.
冷箱系统
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
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【简答题】在测定熔点时样品的熔点低于( )以下,可采用浓硫酸为加热液体, 但当高温时,浓硫酸将分解, 这时可采用热稳定性优良的( )为浴液。
【简答题】热电偶的热电势由______和______组成。
【单选题】— Hi, Mrs. King, your dress looks nice. Is it new? — Oh, no, I bought it _____ .
A.
two years ago
B.
for two years
C.
in two years
D.
two years before
【单选题】—Oh, Mrs. King, your dress looks nice. Is it new? —No, I _ it for two weeks. [ ]
A.
had
B.
bought
C.
have had
D.
have bought
【简答题】在测定熔点时样品的熔点低于 ( )摄氏度以下,可采用浓硫酸为加热液体, 但当高温时,浓硫酸将分解, 这时可采用热稳定性优良的 ( )为浴液。
【单选题】—Oh, Mrs. King, your necklace looks nice. Is it new? —No, I _____ it for two years. [ ]
A.
had
B.
have had
C.
bought
D.
have bought
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