【简答题】偏应力量主值计算时的第二不变量计算方法是()
【单选题】用面包加盐的方式迎接贵宾表示最热烈欢迎的国家是 ()
【单选题】By mentioning the Spirit rover on January 3 the author means ______ .
A.
It's ridiculous to launch robots to space rather than men
B.
Men can solve unexpected problems better than robots
C.
Men are the right stuff that should be launched to space
D.
We should send men and robots to space for efficient work
【单选题】The remarks of the author's friend in Paragraph 3 indicate that Europeans______.
A.
think highly of the American service
B.
find it impossible to accept the American service
C.
do not appreciate the American service
D.
will gradually accept the American service
【简答题】应力主值计算时的第二不变量计算方法是()