【单选题】What did Tom tell Steve's father?
A.
Steve was quite sure that he wanted to be a doctor.
B.
It was too early for Steve to decide his future.
C.
Steve wanted to be a photographer.
D.
Steve wanted to study medical photography.
【单选题】制冷系统进行“热气融霜”时以下说法中不正确的是()。
C.
逆流式”热气融霜,热气由蒸发器回气端引入,而出蒸发器后又导至冷凝器
D.
融霜已毕的蒸发器再投入工作时,应迅速开启尾端载止阀,以利压缩机抽吸残余冷剂
【单选题】在蒸发循环制冷系统中,制冷剂进入蒸发器时的状态是
【单选题】在蒸发循环制冷系统中,制冷剂进入蒸发器时它处于什么状态?()
【单选题】在蒸发循环制冷系统中,制冷剂进入蒸发器时的状态是
【单选题】在蒸发循环制冷系统中,制冷剂进入恒温膨胀阀时它处于:(冷凝器出口液态高压氟利昂经膨胀阀变成低压液态再进入蒸发器,在蒸发器内吸收空调空气的热量)
【单选题】对处于稳态工况的输气管段,在流动方向上维持不变的流动状态参数是()。
【判断题】气体钻井流体是以气体作为分散介质的钻井流体。