不定项选择
公路机电设备的镀锌层厚度不得低于（ ）。A.50μmB.65μmC.85μmD.100μm
单项选择题公路机电设备的镀锌层厚度不得低于（ ）。
Spring is by far___________ time to visit the island.A....
单项选择题Spring is by far___________ time to visit the island.
Tom attended___________ evening school for___________ ...
单项选择题Tom attended___________ evening school for___________ month or two.
