【判断题】三角形螺纹具有较好的自锁性能,螺纹之间的摩擦力及支承面之间的摩擦力都能阻止螺母的松脱,所以已经在振动及交变载荷作用下,也不需要防松。()
【单选题】Mary found it (difficult) to talk (calmly) about (which) she had (experienced) at the station.
【单选题】Mary found____extrerhely difficult to pass the examination.
【单选题】As a result of their experiments, Dr. Corsi's team found that ______.
A.
dishwashers are very efficient machines.
B.
tap water is as polluted as bottled water.
C.
indoor pollution rivals outdoor pollution.
D.
gas masks are a useful protective device.
【简答题】Mary found it difficult to ________ Jim’s father when he disapproved of their marriage. A) stand for B) stand out C) stand by D) stand up to
【判断题】ED途径是少数细菌所特有的一种糖代谢途径,也被称为 KDPG 途径。
【判断题】ED途径是少数细菌所特有的一种糖代谢途径,也被称为KDPG途径。( )
【判断题】运球向前推进无防守时,球的落点应控制在身体的侧前方,并根据推进速度保持适当距离。( )