对于门式起重机的主梁，除了满足上拱度的要求外，若支腿外有悬臂，此悬臂应制成水平的。

A.1/300

B.1/350

C.1/400

D.1/500

A.0.9S/1000

B.0.8S/1000

C.0.7S/1000

D.0.7S/2000

A.S/10

B.S/15

C.S/20

D.S/25

A、+0.4F、-0.1F

B、+0.4F、+0.1F

C、+0.3F、-0.1F

D、+0.5F-0.1F

双梁通用门式起重机和装卸桥主梁上拱度F=S/1000，其最大允许偏差值为()。

A、+0.4F、-0.1F

B、+0.4F、+0.1F

C、+0.3F、-0.1F

D、+0.5F-0.1F

E、-0.1F

F、+0.1F

G、+0.3F

H、+0.6F

I、+0.8F

J、+0.2F

A.0.3

B.0.4

C.0.5

D.0.6