气体保护焊是以气体燃烧为热源,气体作保护介质的焊接方法。()
参考答案:错
往装有25mL盐酸的锥形瓶中逐滴加入NaOH溶液[用V(NaOH)代表加入NaOH溶液的体积],在表示此变化 过程的下列图象中,合理的是[ ]
A.
B.
C.
D.
—The blue skirt looks very nice. May I() —Yes, please.
A. try them on
B. try it on
C. take them off
D. take it off