太太小姐们进客厅来,简爱起身行了屈膝礼,她们()。
A.也给简爱回了礼
B.有一两位点头回礼
C.大多数只是瞪眼看着简爱
D.都瞪眼看着简爱
参考答案:B, C
That was the reason______ Mac gave me the other day. [ ]
A. why
B. for that
C. which
D. for which
执行器在自动调控系统中起什么作用?通常由几部分组成?各自的作用是什么?