消防斧斧头表面抛光部分的表面粗糙度RA值应不大于（）μm。
A.5.2
B.6.3
C.7.2
D.4.8
参考答案：B
You park here! It’s an emergeney exft.
A．wouldn’t
B．necdn’t
C．coukln’t
D．mtontn’t
My neighbours used to give a hand in time of trouble, ________ was very kind of them.[ ]
A. who
B. that
C. what
D. which
