【单选题】关于笛卡尔写给雷迪斯的信,不正确的是:()
【单选题】—Did you see a man in black pass by just now? —No,sir.I ___ a newspaper.
【判断题】(3)由于凸轮的轮廓曲线可以随意确定,所以,从动件的运动规律可以任意拟订。( )
【单选题】The responsibilities of the engineer officer in charge of the watch do not include_____.
A.
to ensure the main propulsion plant are kept under constant surveillance
B.
to ensure the auxiliary systems are kept under constant surveillance
C.
to inspect the steering gear spaces at suitable intervals
D.
to inspect and overhaul the equipments in his charge
【单选题】- Did you see a man in black pass by just now? - No, sir. I _______ a newspaper. [ ]
【单选题】所谓的社会智能,是指下列哪一种智力()?
【简答题】如图,△ABD中,∠BAD=45°,AE⊥BD于E,DF⊥AB于F,交AE于G,BE=4,DE=3,则AG=______.