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【判断题】
一对作用力和反作用力对同一轴的力矩之和必为零A.
正确
B.
错误
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】设集合 A={1,2,3}，则A上的双射函数是( )。
A.
{<1,1>,<2, 3>,<3, 1>}
B.
{<1,2>, <2,2>,<3, 1>}
C.
{ <1,2>,<2, 1>,<3,3>}
D.
{<1,1>,<2,1>, <3,1>}
【单选题】There's _____ _____ with my lamp .
A.
wrong something
B.
something wrong
C.
anything wrong
【简答题】任务型阅读. There are three persons in my family. They are my father, my mother and I. My father works in a computer company (公司). He is very busy. He does many things every day. He gives much money to the...
【单选题】设集合S={A 0 ，A 1 ，A 2 ，A 3 }，在S上定义运算 为：A 1 A=A b ,其中k为I+j被4除的余数，I,j=0,1,2,3.满足关系式=（x x） A 2 =A 0 的x(x∈S)的个数为
A.
4
B.
3
C.
2
D.
1
【单选题】which organ does the picture show?
A.
thyroid gland
B.
thymus
C.
skin
D.
spleen
E.
lymph nid
【单选题】She broke my bicycle lamp_______; that was why Jane was to blame.
A.
accidentally
B.
accurately
C.
positively
D.
deliberately
【单选题】which organ does the type of tissue location:
A.
trachea
B.
esophagus
C.
small intestine
D.
bladder
E.
uterus
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