题目内容

Collecting stamps ______ my favorite when I was young.

A. are
B. is
C. were
D. was

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Once computers ______ how to do it, they will do many things for us.

A. tell
B. told
C. are told
D. are telling

Generally speaking, I prefer mineral water _____ tea.

A. to
B. for
C. with
D. from

试画出开环控制系统与闭环控制系统框图，并比较开环控制系统和闭环控制系统的优缺点。

按崩解时限检查法检查,中药浸膏片应在多长时间内崩解

A. 60min
B. 40min
C. 30min
D. 15min
E. 10min