皮亚杰在《结构主义》一书中曾指出思维结构有()、()、()等三个要素。
参考答案:整体性;转换性;自调性
The answer ________ the teacher,she asked the little boy to try a second time.
A.disappointed
B.disappointing
C.being disappointed
D.having been disappointed
房颤心电图表现为()
A.P波消失,代之小而不规则的基线波动
B.QRS波群通常形态正常
C.R-R间隔绝对不规则
D.颤动波之间等电位线消失
E.房率约350~600次/分