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【单选题】
对于信号f(t)=sin2π*103+sin4π*103的最小采样频率是( )A.
8kHz
B.
4kHz
C.
2kHz
D.
1kHz
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举一反三
【单选题】--Why does Sara know so much about Angkor Wat?--She ______ have been there, or because of some other reasons.
A.
must
B.
oughtn't to
C.
may
D.
can't
【简答题】对我来说，失去时间就是失去生命。我不能还没实现自己设定的目标就离开这个世界。(翻译)
【简答题】对我来说,失去时间就是失去生命。我不能还没实现自己设定的目标就离开 这个世界。missed, set the goal, leave without
【单选题】According to the interview, Sara's grades have fallen probably because ______.
A.
She was tired of the study at school.
B.
She didn't get enough to eat.
C.
She helped too much with the chores.
D.
She always slept in the class.
【单选题】2g 未知物溶解于 250mL 四氯化碳中,用 25cm 长的样品管在钠光灯下测得这种溶液的旋光度 α = −2.5° 。那这个化合物的比旋光度是 。
A.
-59.5º
B.
+59.5º
C.
-29.5º
D.
+29.5º
【单选题】----Did you call Sara back ? ----I didn’t need to ,_____ we’ll have a meeting together tonight.
A.
though .
B.
unless
C.
because
D.
if
【单选题】甲公司为科技型中小企业2019年取得会计利润80万元,当年发生研发支出40万元,未形成无形资产,已做管理费用扣除,假设甲公司无其他纳税调整事项,则甲公司2019年应缴纳企业所得税的下列计算中,正确的是( )。
A.
80×25%=20(万元)
B.
(80-40×50%)×25%=15(万元)
C.
(80-40×75%)×25%=12.5(万元)
D.
(80-40×75%)×15%=7.5(万元)
【判断题】Sara and Irma hated each other at the beginning, but later became friends.
A.
正确
B.
错误
【判断题】Sara and Irma have known each other for three years and have worked together on some films.
A.
正确
B.
错误
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