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【简答题】
下面对线性系统的输入和输出间关系表述正确的是( )。 (A) Y(f)=|H(f)| 2 X(f) (B) S xy (f)=H(f)S x (f) (C) S y (f)=|H(f)|S x (f) (D) S xy (f)=S x (f)S y (f)
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举一反三
【多选题】Watch the video. The ads of some of the following products are mentioned in the discussion. What are they?
A.
automobile
B.
drinks
C.
marmalade
D.
furniture
E.
shoes
F.
ice cream
G.
cream cheese spread
【简答题】如图是某研究性学习小组进行CO 2 与NaOH溶液反应的探究实验装置． 【查阅资料】水的沸点与气体压强有关，气体压强小，沸点低；气体压强大，沸点高． 【实验探究】实验步骤如下： 步骤①：如图所示，锥形瓶A盛满CO 2 气体，锥形瓶B盛有96%以上但未沸腾的热水，烧杯中加入同样温度的热水（起保持锥形瓶B中水温恒定的作用）． 步骤②：取2支注射器，一支抽取20mL水，另一支抽取20mL浓NaOH溶液．...
【多选题】Watch the video and outline five main points of the event.
A.
Introduce the programme “Person of the Week”
B.
Brief introduction to Dr. Rick Hodes, “Person of the Wee k”
C.
Saving hundreds of young lives for 28 years in Ethiopia
D.
What Dr. Hodes did for the poorest patients in the world
E.
A writer’s life changed for helping a young patient with serious deformity
F.
Reason for choosing Dr. Hodes as “Person of the Week”
【简答题】对......满不在乎,对......不屑一顾(phr.)
【简答题】A Watch the video. Read the statements. Write T of F.
【简答题】A Watch the video. Read the statements. Write T of F.
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