喷射泵的流量比(引射系数)是指()体积流量之比。
A.工作流体与被引射流体
B.被引射流体与工作流体
C.工作流体与泵出口流体
D.泵出口流体与工作流体
参考答案:B
某商场出售某种文具,每件可盈利2元,为了支援贫困山区,现在按原售价的7折出售给一山区学校,结果每件盈利0.2元(盈利=售价﹣进价),问该文具每件的进价是多少元?请列出方程.
I actually believe that you_______ in hospital now if you had worn seat belts at that time.
A.weren’t
B.had not been
C.wouldn’t have been
D.wouldn’t be