2.如果一条直线和一个平面垂直,则称此直线与平面构成一个“正交线面对”,在一个正方体中,由两个顶点确定的直线与含有四个顶点的平面构成“正交线面对”的概率为 3/28 。
1.值域为,其对应关系为的函数个数为 27
15、The population of China over 1,200 million and eighty percent of the population peasants.
A、is;are B、are;is C、is;is D、are;are
1-----5BBBDA 6----10AACAC 11----15CDACC
14、A series of debates between the major candidates scheduled for the Labor Day weekend last week.
A、is B、are C、was D、were
13、Five multiplied by two ten.
A、is equal B、equals C、equal with D、equal to
12、 neither you nor your brother interested in swimming?
A、Are B、Is C、Do D、Does
11、It’s not you but Mr Anderson who to answer the incident.
A、are;for B、were;to C、is;for D、was;back
10、 of the land in that district covered with trees and grass.
A、Two fifth;is B、Two fifth;are C、Two fifths;is D、Two fifths;are
9、Up to now,the majority of the undergraduates enrolled for this selected course.
A、has been B、have C、had been D、would have been
8、I don’t think one hundred dollars a big sum of money to him.
A、will be B、would be C、is D、are
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