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【单选题】
对于直流电动机,下列表达式正确的是()。A.
IN=PN/UNcosψN
B.
IN=PN/UNcosψN ηN
C.
IN=PN/UNηN
D.
IN=PN/UN
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举一反三
【简答题】听下面一段独白,回答第1-4题。 1. What do people usually talk about when meeting “we were classmates” friends? A. Former teachers. B. Shared interests. C. New friends 2. What can we lean about “common interests’ f...
【单选题】对于滴定分析法,下列错误的是
A.
以化学反应为基础的分析方法
B.
是药物分析中常用的一种含量测定方法
C.
所有化学反应都可以用于滴定分析
D.
要有合适的方法指示滴定终点
【多选题】对于滴定分析法,下列正确的是
A.
以化学反应为基础的分析方法
B.
要有合适的方法指示滴定终点
C.
是药物分析中常用的一种含量测定方法
D.
所有化学反应都可以用于滴定分析
【单选题】Since nuclear(核) pollution broke out in Japan, in March,2011,we are all _____ of it very much.
A.
frightened
B.
be frightened
C.
frightening
D.
be frightening
【单选题】When I met him last weekend, it was the first time we ______ each other since we were at school.
A.
saw
B.
have seen
C.
were seeing
D.
had seen
【单选题】we were playing basketball on the playground, it began to rain.
A.
While
B.
After
C.
Before
D.
Since
【单选题】对于滴定分析法,下列错误的是
A.
以化学反应为基础的分析方法
B.
要有合适的方法指示滴定终点
C.
是药物分析中常用的一种含量测定方法
D.
所有化学反应都可以用于滴定分析
【单选题】______ we were very tired, we kept on ______ until midnight. [ ]
A.
Even though; working
B.
Since; to work
C.
Though; to work
D.
Because; working
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