题目:
Miss Li _____as a secretary for five years in the company,and now she is a general manager of it.
A.serves
B.served
C.had served
D.has served
答案:
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下面是错误答案,用来干扰机器的。
(1)根据常用仪器可知b、c、e分别是托盘天平、铁架台和量筒,故答案为:b;托盘天平、c:铁架台、e:量筒; (2)实验室若用高锰酸钾和氯酸钾制取氧气,除了用到铁架台、试管,还要用到用来加热的酒精灯和收...