Body language is important in an interview. Sit up straight and don’t _______ in your chair.
A. slouch
B. sleep
C. posture
D. crouch
查看答案
What is the name for a company that works on behalf of employers to find employees?
A. a recruitment agency
B. an enrolment agency
C. a conscription service
D. a vacancy
液体从孔口以射流状态流出，在流出孔口后0.5d处形成收缩断面。
A. 对
B. 错
所有孔口断面上各点的流速相差均不大，可以按均匀分布计算。
A. 对
B. 错
薄壁出流，流体与孔壁只有周线上接触，孔壁厚度不影响射流形态。
A. 对
B. 错
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