矩形截面杆AB,A端固定,B端自由。B端右下角处承受与轴线平行的集中力F,杆的最大正应力是()。
A.(A)
B.(B)
C.(C)
D.(D)
参考答案:D
对于难以返工又难以确定的质量部位,由有()的检测单位检测鉴定。
A.有能力的
B.验收组织机构指定的
C.有经验的
D.有资质的
The secret agent concealed his real mission, so many local people were()into thinking that he was a good person.
A.betrayed
B.driven
C.deceived
D.convinced