额定功率下,节流调节比喷嘴调节更()。
参考答案:经济
列车沿长直的水平轨道匀速行驶,一乘客向上跳起,又落到车厢里.他落到车厢地板的位置( )
A.正好是他起跳的位置
B.在他起跳位置的前方
C.在他起跳位置的后方
D.在他起跳位置的左侧或右侧
----You’ve never seen him these years, _________ ?
----No, I_________. He _________ abroad since ten years ago.
A.have you, haven’t, has been
B.have you , haven’t, have gone
C.haven’t you, have, went
D.don’t you, don’t, goes