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【多选题】
以下哪几项不是我国的标准体系( )。A.
国家标准
B.
企业标准
C.
行业标准
D.
地方标准
E.
协会标准
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反馈参考答案：
举一反三
【单选题】听力原文：Is he your friend? (14)
A.
Yes, he's your friend.
B.
Yes, we are good friends.
C.
Yes, I've got a friend.
【单选题】— ______? — He's great. [ ]
A.
What's your friend
B.
How does your friend know it
C.
What do you think of your friend
D.
How do you know your friend
【单选题】关于信号【图片】描述正确的是__________。
A.
该信号的基波频率是 1 Hz
B.
该信号是非周期信号。
C.
该信号的基波角频率是 1 rad/s。
D.
该信号的平均功率是 0.25 W。
【单选题】What will your support mean to your friend?
A.
It may help your friend succeed.
B.
It may let your friend feel valued.
C.
It may make your friend find his true self.
D.
It may make your friend feel closer to you.
【单选题】关于信号【图片】描述正确的是（ ）。
A.
该信号是非周期信号。
B.
该信号的基波角频率是 1 rad/s。
C.
该信号的基波频率是 1 Hz。
D.
该信号的平均功率是 0.25 W。
【单选题】You and your friend are enrolled in the same class. You do not have time to study and ask your friend if you can copy from him during the exam. Your friend reluctantly agrees. Has your friend commi...
A.
Yes
B.
No
C.
It depends
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