原式=(23)2-(5)2
=12-5
=7.
故答案为7.
–Whose advice do you think I should take?
–______.
A.You speak
B.That's it
C.It's up to you
D.You got it
支搭跨越架的目的是保护线材免于()。
A、车压
B、磨损
C、人踩