門座式起重機司機（中級）單項選擇題每日一練(2019.01.20)

A.三連桿
B.四連桿
C.五連桿
D.六連桿

A.200
B.400
C.20
D.40

A.φ100H8/f8
B.Φ80F8/h8
C.Φ70M6/h7
D.Φ100G8/h8

A.90%
B.100%
C.110%
D.105%

A.40－50
B.50－60
C.60－70
D.70－80