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【单选题】
Excel 是 Microsoft 公司提供的一个()A.
操作系统
B.
表格处理软件
C.
文字处理软件
D.
数据库管理系统
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举一反三
【简答题】We were struck by the extent ________ which teachers’ decisions served the interests of the school rather than those of the students. A) to B) for C) in D) with
【简答题】求图8．1所示周期函数的拉氏变换． 求下列函数的拉氏逆变换(像原函数)，并用另一种方法加以验求下列函数的拉氏逆变换(像原函数)，并用另一种方法加以验证．
【简答题】Teachers always encourage their students ________ more confident. [ ] A) to be B) be C) are D) were
【多选题】关于晶闸管导通角α的说法错误的是（）。
A.
导通角α越大，则晶闸管整流输出电压越高
B.
导通角α越大，则晶闸管整流输出电压越低
C.
导通角α越大，则电动机的转速越低
D.
控制极电压越高，则导通角α越小
【单选题】What can we draw as a conclusion of the speech?
A.
We have no choice but to panic because we’re far from ready for the next epidemic.
B.
We need to store cans of spaghetti or go down into the basement for the next epidemic.
C.
There is not a single positive thing that can come out of the Ebola epidemic.
D.
If we start now, we can be ready for the next epidemic.
【单选题】From the passage we can draw a conclusion that if we want to keep healthy, we should______.
A.
only eat an apple a day
B.
eat properly
C.
take as many vitamin pills as possible
D.
throw something into our stomachs slowly and carefully
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