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【判断题】
常微分方程数值解法中,梯形公式的精度低于公式的精度。( )A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】患者男，27岁，既往有消化道溃疡病史4年，突发上腹部刀割样疼痛，迅速蔓延至全腹，服抗生素后不能缓解，症状加重，6h后于急诊求治。经腹部X线平片诊断为：急性弥漫性腹膜炎，消化性溃疡穿孔。引起继发性腹膜炎的细菌中，最多见的是（）
A.
链球菌
B.
大肠埃希菌
C.
变形杆菌
D.
厌氧类杆菌
E.
肺炎球菌
【简答题】We had good time boating in the West Lake last weekend.
【简答题】Look at the picture. This is our school. There are five buildings in our school. There are thirty-two classrooms in the Teaching Building. Our gym is behind the Teaching Building. The teacher’s office...
【单选题】They had a good talk last night, which had ______three hours before they knew it.
A.
eaten up
B.
eatenout
C.
eaten
D.
eaten away
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