定熵滞止参数。
参考答案：
将具有一定速度的流体在定熵条件下扩压，使其流速降低为零，这时气体的参数称为定熵滞止参数。
Eric was well prepared for the computer test so that he could be positive about passing it on his first________.
A．intention
B．attempt
C．purpose
D．desire
溞类活动抑制试验中，在稀释水加入到受试物中之前需要曝气。
