“ Need he go?” “ Yes, he ______.”
A.need
B.can
C.may
D.must
答案:D
井下导线点的选择,应综合考虑哪些因素?
半刚性悬架的特点哪个是正确的?()
A.减震性能好
B.坚固耐用
C.拆装方便
D.结构简单