【单选题】关于笛卡尔写给雷迪斯的信,不正确的是:()
【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。( )
【简答题】____ is a licensing agreement, under which the____ grants the ____ the right to sell or use the formers product, service or method in return for a ____ from the latter.
【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】有人设计出利用CH 4 和O 2 的反应,用铂电极在KOH溶液中构成原电池.电池的总反应类似于CH 4 在O 2 中燃烧,则下列说法正确的是( ) ①每消耗1molCH 4 可以向外电路提供8mole - ②负极上CH 4 失去电子,电极反应式CH 4 +10OH - -8e - =CO 3 2- +7H 2 O ③负极上是O 2 获得电子,电极反应式为 O 2 +2H 2 O+4e - =4O...
【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=______.