Susan decided not to work on the program_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题选择题

Susan decided not to work on the program at home because she didn't want her mother to know what she _____.

A. has done
B. had done
C. was doing
D. is doing

答案

答案：C

单项选择题

REM睡眠约占总睡眠时间的比例为（）

A.5％～10％

B.10％～15％

C.15％～20％

D.20％～25％

E.25％～30％

问答题简答题

汽轮机热力特性试验可采用哪几种方法进行？