A
B
C
D
1.What surprises the girl at school?A.A lot of discussions in class.B.Teachers giving little homework.C.Few students asking questions in class.
2.铰链四杆机构ABCD,如果以BC为机架(静件),当机构为双曲柄机构时,各杆的长度可为()。A、AB=130 BC=150 CD=175 AD=200B、AB=150 BC=130 CD=165 AD=200C、AB=175 BC=130 CD=185 AD=200D、AB=200 BC=150 CD=165 AD=130
3.单选题AABBCCDD
4.What surprises the girl at school?A.A lot of discussions in class.B.Teachers giving little homeworkC.Few students asking questions in class.