当牌号为HRB335钢筋接头进行弯曲试验时，弯曲直径应取（）。
A.2d
B.4d
C.5d
D.6d
参考答案：B
More than one doctor _____ involved in the rescue that took place after the earthquake.[ ]
A. were
B. was
C. are
D. is
胃大部切除通常是指切除全胃的（）。
A.50%
B.55%
C.60%
D.80%
E.65%~75%
