直线区段中间支柱折断时，需将承力索用双钩紧线器在断杆相邻支柱_爱下问搜题

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问题单项选择题

直线区段中间支柱折断时，需将承力索用双钩紧线器在断杆相邻支柱定位处紧一下张力，要保证导线高度最低多少（）

A.5330mm

B.5350mm

C.5370mm

D.5390mm

答案

参考答案：B

选择题

Though he had often made his little sister _____, today he was made _____by his little sister. [ ]

A. cry；to cry

B. crying；crying

C. cry；cry

D. to cry；cry

填空题

当x=______ 时，分式

的值是零．