【单选题】用l20°C的饱和蒸汽加热原油,换热后蒸汽冷凝成同温度的冷凝水,此时两流体的平均温度差之间的关系为( )并流 ( ) ( )逆流
【单选题】When the tail-shaft is drawn from a vessel in dry-dock, which of the following inspections is required to be carried out?
A.
The propeller hub taper and shaft keyway should be inspected for cracks or corrosion.
B.
The stern bearing alignment with the stern frame should be checked
C.
The interior of the stern tube should be inspected for leaks
D.
The shaft liner should be removed and inspected
【判断题】鹰架教学是指:为儿童提供教学,并逐步转化为提供外部支持的过程。
【简答题】完成第一课文型、例文口语作业 文型音频40秒,例文20秒内完成
【简答题】The delayed value of rotation angle of the output shaft when the rotation of input shaft turns from positive to negative is .