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无处不在的机械原理|星岛教室
「连杆机构」在交通工具中以四连杆构件最常见。「瓦特连杆」是英国传奇发明家兼工程师詹姆斯.瓦特(James ...
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今日热点
Senate advances nomination
Confirmed as CIA director
Hughes Fire prompts evacs
Judge halts executive order
Slander conviction upheld
Trump pardons DC officers
NYC aesthetician charged
KKK flyers in Kentucky
Houston refinery closure
New panel to probe Jan. 6
Thai same-sex marriage law
Exits Quebec operations
San Antonio officers shot
'Bling Empire' star dies
Former NC judge dies
Defends diversity policies
ACLU sues over deportations
Picked as ambassador to EU
Curran to lead Secret Service
DOJ halts civil rights work
Sentenced to over 50 years
Mulls SC governor’s bid
Announces return to skiing
CNN announcing layoffs
ICC targets Taliban leaders
Recalling over 270K vehicles
Jobless claims rise slightly
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