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【单选题】
一个质点同时在几个力作用下的位移为：【图片】;其中一个力【图片】，则此该位移过程中所作的功为(SI):
A.
-67J
B.
17J
C.
67J
D.
91J
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A.
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B.
单相铁素体
C.
珠光体＋铁素体
D.
可锻铸铁
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A.
正确
B.
错误
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【判断题】钢筋混凝土梁斜截面抗剪承载力计算时,梁的汁算剪力包络图是计算得到的各截面最大剪力组合设计值V d 乘上结构重要性系数γ 0 。后所形成的计算剪力图。
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【简答题】原核生物与真核生物mRNA有何特点?
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【判断题】双曲柄机构中,通常主动曲柄作匀速运动,从动曲柄做同向匀速转动。
A.
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【单选题】配有腹筋的钢筋混凝土梁斜截面抗剪承载力计算时,若计算公式 的上限值不满足,则应( )。
A.
加大截面尺寸或提高混凝土强度等级
B.
减小截面尺寸或提高混凝土强度等级
C.
加大截面尺寸或降低混凝土强度等级
D.
减小截面尺寸或降低混凝土强度等级
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【单选题】耐热铸铁大多为（）基体的球墨铸铁。
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【判断题】双曲柄机构中,通常主动曲柄作匀速运动,从动曲柄做同向匀速转动。
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正确
B.
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【单选题】配有腹筋的钢筋混凝土梁斜截面抗剪承载力计算时,若计算公式 的上限值不满足,则应( )。
A.
加大截面尺寸或提高混凝土强度等级
B.
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