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【单选题】
若某点的三个主应力分别为3σ，2σ和σ。已知材料的弹性模量E和泊松比µ，选用第二强度理论，则该点的相当应力【图片】为（ ）。A.
0
B.
3σ（1-μ）
C.
3σ
D.
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举一反三
【单选题】若要定义一个10个元素的整数数组,每个元素的值均为5,则下列语句正确的是___________。
A.
Dim a%(9) = 5
B.
Dim a%(10) = 5
C.
Dim a%(9), i% For i = 0 To 9 a(i) = 5 Next
D.
Dim a%(9) = (5)
【简答题】Lucy should to the underground station, and then go to the airport by the .
【单选题】— Don't worry, Mum. The doctor said it was only the flu. —_______! I'll tell Dad there's nothing serious. [ ]
A.
What a relief
B.
Congratulations
C.
How surprising
D.
I'm so sorry
【单选题】—Don't worry，Mum.The doctor said it was only the flu. —________！I'll tell Dad there's nothing serious.(2012·江苏，24)
A.
What a relief
B.
Congratulations
C.
How surprising
D.
I'm so sorry
【单选题】If it is clear tomorrow, I ______ a bike to the underground station.
A.
ride
B.
will ride
C.
rode
D.
have ridden
【单选题】Don't worry, Mum. I am sure Kitty and Ben can manage to do everything by ______. [ ]
A.
yourself
B.
myself
C.
themselves
D.
ourselves
【简答题】调质处理就是()后再进行()的热处理的工艺方法。
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