在5-111题中各压杆,可能在x1z平面内失稳的有()
A. 图(e)、(h)
B. 图(e)、(h)
C. 图(a)、(b)、(d)、(j)
D. 图(f)、(i)
参考答案:C
The building around the corner caught fire last night. The police are now ______ the matter.
A.getting through
B.working out
C.looking into
D.watching over
羊膜卵的出现在动物演化史上的意义。