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【单选题】
线性系统的叠加原理表明。AA.
加于线性系统的各个输入量所产生的响应过程互不影响
B.
系统的输出响应频率等于输入激励的频率
C.
一定倍数的原信号作用于系统所产生的响应，等于原信号的响应乘以该倍数
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举一反三
【单选题】She wants to be a ping-pong player, _____ she likes to play ping-pong. [ ]
A.
so
B.
because
C.
to
D.
for
【单选题】She is going to take ________ lessons because she wants to be an actress. [ ]
A.
musician
B.
dancing
C.
acting
D.
piano
【单选题】Jane will have to _____ her piano practice a long time if she wants to be a professional concert performer. [ ]
A.
set up
B.
add up
C.
keep up
D.
hold up
【单选题】She is going to take _______lessons because she wants to be an actress. [ ]
A.
music
B.
dancing
C.
acting
D.
basketball
【简答题】商品学研究的中心内容
【单选题】Why did Linda Smith write to Patrick Jane?
A.
Because she wants to be a tutor in his family.
B.
Because she likes making friend with him.
C.
Because she wants to get the job as a housemaid.
D.
Because she wants to cook food for him.
【单选题】She likes ,so she wants to be a .
A.
cooking,cook
B.
cook,cooking
C.
cooking,cooker
D.
cook,cook
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