肠套叠病人大便的特征是（）
A.脓血便
B.果酱样黏液血便
C.黏液脓血便
D.血粪混合物
E.血便
参考答案：B
It is commonly assumed that the growth of GDP and the development of people’s living conditions are not _______cause and effect.
A．nearly
B．possibly
C．purposely
D．necessarily
检修动力电源箱的支路开关、临时电源都应加装（）。
