不经计算,可直接判定得知图示桁架中零杆的根数为()根。
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A.workB.dealC.cutD.get away
A. work
B. deal
C. cut
D. get away
A.couldB.mayC.mustD.should
A. could
B. may
C. must
D. should
A.infectionB.infectC.infectingD.infected
A. infection
B. infect
C. infecting
D. infected
A.forB.withC.toD.at
A. for
B. with
C. to
D. at