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【简答题】
简易起重设备的计算简图如 下 图 (a) 所示。已知斜杆 AB 用两根 63mmX40m m X4mm 不等边角钢组成,此角钢 横截面积 A=4.058cm 2 , 钢的应力 [ σ ]= 170MPa 。试问在提起重量为 P= 15kN 的重物时,斜杆 AB 是否满足强度条件 ?
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举一反三
【单选题】Professor Waters
A.
knows well how to teach English.
B.
is a new hand in writing books.
C.
writes books in different fields.(领域)
D.
is very good at speaking English.
【单选题】Professor Waters
A.
knows well how to teach English.
B.
is a new hand in writing books.
C.
writes books in different fields.
D.
is very good at speaking English.
【单选题】Professor Waters has taught English
A.
to students from many felds.
B.
in many different countries.
C.
to experienced teachers in China.
D.
for a number of years in England.
【单选题】Professor Waters has taught English
A.
a. to students from many fields.
B.
in many different countries.
C.
to experienced teachers in China.
D.
for a number of years in England.
【单选题】Professor Waters has taught English
A.
to students from many fields.
B.
in many differents countries.
C.
to experienced teachers in China.
D.
for a number of years in England.
【判断题】[色谱分析法中级第50题]高效液相色谱分析中,选择流动相的一般原则为纯度高、黏度低、毒性小、对样品溶解度高以及对检测器来说无响应或响应不灵敏。()
A.
正确
B.
错误
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