下列不定积分计算正确的是()
A.
B.
C.
D.
参考答案:D
解析:
这类题可以通过直接计算不定积分后进行选择,也可以对不定积分求导看是否等于被积函数而进行选择.
B)根据句子意思,用括号中所给单词的适当形式填空。
小题1:My family live on the ▲ (five) floor of the tall building.
小题2:— Why do you say Sandy does her homework ▲ (careful)?
— Because she always makes many mistakes in her homework.
小题3:Yesterday I ▲ (buy)a new dress at the Macy’s for my mum.
小题4:Today most students can go to high school for further ▲ (educate) in our country.
小题5:You needn’t be frightened because these insects are completely ▲ (harm).
胸片有空洞的咯血不见于()
A.肺结核
B.肺癌
C.肺炎
D.特发性肺含铁血黄素沉着症
E.韦氏肉芽肿病