试成孔完成后24小时内等间隔检测不宜少于（）次，每次应定向检测
A.1
B.2
C.3
D.4
参考答案：D
Smoking is not _______ in this factory but it is _______ in certain workshops.
[ ]
A. permitted; allowed
B. allowed; permitted
C. admitted; permitted
D. permitted; admitted
MRI扫描中，坏死物多呈长T1长T2信号。（）
