足月新生儿，因第二产程延长，胎心减慢，行产钳助产娩出，1分钟Apgar评分4分，首先
题型：单项选择题
问题：
足月新生儿，因第二产程延长，胎心减慢，行产钳助产娩出，1分钟Apgar评分4分，首先应采取的措施是（）
A.人工呼吸及心脏按压
B.供给氧气
C.注射呼吸兴奋剂
D.清除气道分泌物
E.纠正酸中毒
题型：单项选择题
下面短文中有10处语言错误。请在有错误的地方增加、删除或修改某个单词。
增加：在缺词处加一个漏字符号（∧），并在其下面写上该加的词。
删除：把多余的词用斜线（＼）划掉。
修改：在错的词下划一横线，并在该词下面写上修改后的词。
注意：1. 每处错误及其修改均仅限一词； 2. 只允许修改10处, 多者(从第11处起)不计分。
Today is Sunday. The sky is full of sunshine; so does my life. At about 9:00 a.m., I go to the bookstore with my friends. There was a lot of new books. I didn’t know which one to buy, because these books were all useful to me. At last, I chose two. At 10:00, we went to the cinema. The film calling Titanic was very popular. It took us about 3hours to see. Having seen a film, everyone was deeply moved. Some friends even burst into tear. From the story, I understand that love is noble but valuable. That’s a real wonderful film. I
t is well worth seeing again.
What a happy day! I hope tomorrow I will be even happy!
，则弹簧的弹性势能的表达式为 (用题中所给字母表示)；
图像，如图丙所示，已知该图线的斜率的绝对值为k，则可算出滑块与导轨间的动摩擦因数为 ．