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【单选题】
关于磁屏蔽的描述，错误的是A.
磁屏蔽的主要目的是减小边缘场的范围
B.
磁屏蔽分为有源屏蔽和无源屏蔽两种
C.
所有磁共振成像系统都需要进行磁屏蔽
D.
无源屏蔽使用铁磁性屏蔽体
E.
有源屏蔽由一个磁屏蔽线圈或线圈系统组成
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举一反三
【单选题】Which of the following statement is NOT true according the powerpoint slides?
A.
It’s lucky to sweep the floor during the first five days of the Lunar New Year
B.
On the fifteenth day of the first lunar month, people often celebrate the Lantern Festival.
C.
The Chinese government now stipulates people have seven days off for the Chinese Lunar New Year.
D.
If a dish is broken, it’s vital to say “suei suei ping an” ,means every year will be safe and secure.
【单选题】It’s a dish which __________ of meat, potatoes, tomatoes and spices.
A.
consists
B.
makes
C.
does
D.
takes
【简答题】电力线路过电流保护的动作电流按躲过最大负荷电流整定。（）
【单选题】I can hardly say which dish is best –it’s simply a（n） _____ of personal taste．
A.
affair
B.
event
C.
matter
D.
attitude
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