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皮皮学刷刷变学霸
举一反三
【单选题】When a tornado moves over the water from land it is called a（）.
A.
Tornado
B.
Waterspout
C.
Hurricane
D.
Cyclone
【单选题】Anna says sally is ____ in the world.
A.
The kindest girl
B.
Kindest girl
C.
Most kind girl
D.
The most kind girl
【单选题】When the tutor asks Anna Maria about taking a maths option, she says ______.
A.
she wants to take one because she was good at maths at school
B.
she doesn't want to take one because she feels confident in maths
C.
she doesn't want to take one because she doesn't need maths
【简答题】One of Anna’s friends has chickenpox(水痘). Two days later, Katie has chickenpox. Anna’s mother says: “ Your best friend has chickenpox . We have to keep an eye on you.” The next evening, Anna finds som...
【简答题】单相半波可控整流电路电感性负载接续流二极管,α=90°时,输出电压Ud为( )。
【单选题】单相半波可控整流电路电感性负载接续流二极管.a-90 . 时.输出电压U d 为( ).
A.
0.45U 2
B.
0.9U 2
C.
0.225U 2
D.
1.35U 2
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