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【单选题】
若生产某物品所需要的原材料价格上升,则这种物品的( )。A.
供给曲线向左移动
B.
供给曲线向右移动
C.
需求曲线向左移动
D.
需求曲线向右移动
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皮皮学刷刷变学霸
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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.
【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 vacationed in Canada last summer? —No, it______for many days when we arrived, so the roads were very muddy.
A.
was raining
B.
would be raining
C.
had been raining
D.
rained
【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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