皮皮学，免费搜题
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【单选题】
好多人喜欢去大商场购物,这并不是因为他们有钱,而是因为商场里的东 以保证质量,还可以退换,所以顾客很放心。顾客为什么喜欢去商场购物 ?A.
东西可以打折
B.
东西样式好
C.
服务员态度好
D.
东西质量好
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】I'm sorry you've waited so long, but there will be some time _______ Bran gets back
A.
when
B.
since
C.
till
D.
after
【简答题】What should you do if a machine jams
【单选题】What's the mark of third generation of computer?
A.
Transistor
B.
Integrated circuit
C.
Silicon
D.
Very large scale of integrated circuit
【简答题】lf a machine jams, take time to undo the jam or to tell the proper person to attend to it.
【单选题】Bobby: Where's the food I ordered? I've waited for thirty minutes! Waiter: I'm really sorry, but the kitchen is very busy. You'll have it _______. [ ]
A.
already
B.
early
C.
once
D.
soon
【单选题】One of the great revolutions of all time that occurred in 1948 was ______.
A.
the invention of a transistor
B.
the discovery of silicon
C.
the production of a crystal called a diode working like a valve
D.
the beginning of the start of microelectronics
【多选题】(), () and( ) are electronic components.
A.
vacuum tube
B.
integrated circuit
C.
silicon
D.
transistor
【单选题】Which electronic component is this graphical symbol illustrating?
A.
Diode
B.
Tunnel diode.
C.
Transistor
D.
Silicon controlled rectifier.
【多选题】()、()、()are electronic components
A.
vacuum tube
B.
integrated circuit
C.
silicon
D.
transistor
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