单项填空1.It's time () go to workA.of us to B.for we to C.we wil
单项填空
1.It's time () go to work
A.of us to B.for we to C.we will D.for us to
2.I want three tickets () the concert
A.for B.to C.from D.on
3.the boy () a tree,but he was all right
A.climbed B.feel down C.fell off D.felt off
1.It's time () go to work
A.of us to B.for we to C.we will D.for us to
2.I want three tickets () the concert
A.for B.to C.from D.on
3.the boy () a tree,but he was all right
A.climbed B.feel down C.fell off D.felt off
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一直径d=14mm的圆杆,许用应力 [σ]=170MPa，受轴向拉力FP=2.5kN作用,试校核此杆是否满足强度条件.
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