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小题1:Jack wants to go to the zoo early next Thursday．The zoo will open at__________． A．9：00 a．m． B．10：00 a．m． C．4：00 p．m． D．5：00 p．m． 小题2:If visitors cannot see the animals, the animals may be______． A．playing B．eating C．acting D．sleeping 小题3:Jack is eight years old．He goes to the zoo with his 58-year-old grandfather．How much should they pay for visiting the zoo? A．$18． B．$22． C．$28． D．$32． 小题4:What should we do in order not to frighten the animals? A．We should ride bikes． B．We should keep quiet． C．Ｗe should feed the animals． D．We should keep the zoo clean．
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【单选题】The truss type fuselage frame is usually constructed of steel tubing ______together in such a manner that all members of the truss can carry both tension and compression loads.
A.
riveted
B.
bolted
C.
welded
D.
bonded with adhesives
【单选题】When supporting the same magnitude of force, truss members in compression are generally made _______ as compared to members in tension.
A.
Thicker
B.
Thinner
C.
The same size
【简答题】未予说明时,室内给水管道、供暖管道、矩形风管的标注标高分别指管道什么部位的标高?
【单选题】One of the assumptions used when yzing a truss is that the members are joined together by __________.
A.
Welding
B.
Bolting
C.
Riveting
D.
Smooth pins
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