全程跟单是指“跟”到货款到账,合同履行完毕为止。
参考答案:对
--Will you please give me some ideas on __________ English at home?
--Well, do a lot of reading and listen to English programs.
A.how to read
B.how to learn
C.when to use
D.where to use
测速管流量计的测量原理是,装在管道中心的一根带有小孔的金属管,末端对着流体流向,以侧流体的动压力。