对于摩擦桩群桩基础,其沉降通常比单桩()。
A.大
B.小
C.相等
参考答案:A
When you introduce me to Mr. Johnson, could you please say ____ for me? [ ]
A. everything
B. anything
C. something
D. nothing
ZD6-J型转辙机的主、副挤切(连接)销分别为()。
A.3t/3t
B.3t/5t
C.3t/9t
D.5t/9t