如图所示一截面图形,则对y轴的形心主惯性矩为()。
A.1.01×106mm4
B.1.01×107mm4
C.1.61×106mm4
D.1.61×107mm4
参考答案:D
---Why does Tommy look excited ? --- Because he can’t wait ______ part in the basketball match.
A.to take
B.take
C.takes
D.takeing
()文物点的密度、数量、等级均居全国首位。