胡萝卜播种时踩底格子和上格子主要是使种子与土壤密切接触。
参考答案：对
─ There is some soup on the table, isn't ____?
─ No, I think that's water. [ ]
A. there
B. it
C. that
D. one
金葡菌合并脓胸时，下列哪种情况不适合做胸腔闭式引流（）
A.患儿年龄低于6个月，中毒症状明显者
B.反复穿刺排脓不畅
C.张力性气胸
D.脓胸伴脓液黏稠
E.多房性包裹性胸腔积液
