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【单选题】
在香港飘扬了一百五十多年的英国米字旗最后一次在这里降落后,接载查尔斯离任港督康回国的英国皇家游轮“不列颠尼亚”号驶离维多利亚港湾一一这是英国撤离香港的最后时刻。(选自课文第一段) 此破折号的用法是A.
声音的延续
B.
语义的转折
C.
解释说明
D.
话题的转换
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【单选题】系统的幅频特性|H(ω)|和相频特性如图(a)(b)所示,则下列信号通过该系统时,不产生失真的是 ( )。
A.
f(t) = cos(t) + cos(8t)
B.
f(t) = sin(2t) + sin(4t)
C.
f(t) = sin(2t) sin(4t)
D.
f(t) = ［cos(4t)］^2
【简答题】—Was the driving pleasant when you went to Mexico last summer? —No, it ________ (rain) for four days when we arrived, so the roads were very muddy.
【单选题】Look at that lady. ___________ is my teacher. ___________ eyes are big. [ ]
A.
He, His
B.
She, She
C.
She, Her
【简答题】电子档案信息可以不受时间和空间限制通过网络传播的属性是（ ）。 A、共享性 B公开性 C、公众性 D、空间性
【单选题】系统的幅频特性|H(ω)|和相频特性如图(a)(b)所示,则下列信号通过该系统时,不产生失真的是 ( )。
A.
f(t) = cos(t) + cos(8t)
B.
f(t) = sin(2t) + sin(4t)
C.
f(t) = sin(2t) sin(4t)
D.
f(t) = cos2(4t)
【简答题】Was the driving pleasant when you went to Mexico last summer?A. , it ____ for four days when we arrived, so the roads were very muddy. B. was raining B. had been raining C. would be raining D. rai...
【单选题】--Was the driving pleasant when you vocationed in Mexico last summer? ----No, it ___ for four days when we arrived, so that the roads were very muddy.
A.
was raining
B.
had been raining
C.
would be raining
D.
have rained
【单选题】-- Was the driving pleasant when you vacationed in country last summer?-- No, it ______ for four days when we arrived, so the roads were very dirty.
A.
was raining
B.
would be raining
C.
had been raining
D.
have rained
【单选题】—Was the driving pleasant when you vacationed in Mexico (墨西哥) last summer? —No, it______ for four days when we arrived so that the roads were very muddy.
A.
was raining
B.
had been raining
C.
would be raining
D.
have rained
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