【简答题】金属钛因为具有神奇的性能越来越引起人们的关注,是航空、宇航、军工、电力等方面的必备原料。已知钛原子的相对原子质量为 48 ,核电荷数为 22, 其质子数为 ________ ,核外电子数为 _______ , 中子数为 _______
【单选题】I was close to being killed the other day. A car passed me at ____ I thought was a dangerous speed.
【单选题】加大人力资源培育力度,要弘扬( ),营造劳动光荣的社会风尚和精益求精的敬业风气。
【单选题】The police stopped me the other day as I was driving home, because I was ______ the speed limit.
【判断题】The actuator speed is determined by a pressure reducing valve.
【单选题】加大人力资源培育力度,要弘扬( ),营造劳动光荣的社会风尚和精益求精的敬业风气。
【判断题】The actuator speed can be reduced by a restrict valve.
【多选题】What kinds of actuator are there in actuation system?
A.
Electromagnetic actuator
【简答题】The pressure of the hydraulic system is decided by , and the movement speed of the actuator is decided by .