Tom was made _______ his own clothes by his mother. [ ]
A. wash
B. washed
C. to wash
答案:C
单纯性机械性肠梗阻的临床特点是()。
A.阵发性腹痛伴肠鸣音亢进
B.持续性绞痛,频繁呕吐
C.持续性剧痛,腹胀不对称
D.持续性胀痛,肠鸣音消失
E.腹胀明显,肛门停止排气
钢筋混凝土是属于哪种异类组合()
A、材料组合
B、原件组合
C、技术组合
D、方法组合