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【单选题】
口角炎是由于缺乏 ( ) 。A.
维B1
B.
维B2
C.
维B6
D.
维B12
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举一反三
【多选题】The costs of product usually consist of：
A.
Material costs
B.
Labor costs
C.
Distribution costs
D.
Marketing costs
【单选题】A.The costs for it are usually higher.B.It cant be fulfilled without computer.#
A.
The costs for it are usually higher.
B.
It cant be fulfilled without computer.
C.
People cant study at their own pace.
D.
There are no face-to-face communications.
【多选题】The costs of product usually consist of：
A.
Material costs
B.
Labour costs
C.
Distribution costs
D.
Marketing costs
【单选题】Some audience complain that it usually __________ too long to watch the ads during TV series.
A.
costs
B.
spends
C.
takes
D.
spares
【多选题】The costs of a product usually consist of:
A.
material costs
B.
labor costs
C.
distribution costs
D.
marketing costs
【简答题】共集电极放大电路又叫 ______ ,其电路特点为: ______ ,输出电压与输入电压 ______ ,输入电阻 ______ ,输出电阻 ______ 。由于它的这些特点,该电路常常被用作多级放大电路的 ______ 、 ______ 或 ______ 。
【简答题】电控燃油喷射( EFI)主要包括喷油量,喷射正时,燃油停供和( )的控制
【多选题】The costs of product usually consist of:( )
A.
Labor costs
B.
Material costs
C.
Distribution costs
D.
Marketing costs
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