判断题传动轴通常采用脆性材料制成,可选用第一或第二强度理论校核强度。()
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1.阅读短文,判断句子正误,正确的写T,错误的写F。 The world's longest high -speed railway route, running from Beijing to Guangzhou, has been in operation for a few years. It cuts travel time between the two cities from 22 ho
A.The
B.The
C.As
D.()26.
E.()27.
F.()28.
G.()29.
H.()30.
I.
4.判断题物体相对周围物体保持静止称为平衡。()
8.单项选择题()写了《寂静的春天》。
A、勒庞
B、都德
C、霍布斯
D、蕾切尔·卡逊
9.单项选择题()的出现引发了产业革命。
A、蒸汽机
B、发电机
C、纺织机
D、工具机
10.判断题使微段梁弯曲变形凹向上的弯矩为正。()
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