鞘内注射预防中枢神经系统白血病后患者头痛的最常见原因为（）
A.颅内感染
B.化学性蛛网膜炎
C.白质脑病
D.脑梗死
E.蛛网膜下腔出血
参考答案：B
(2013·江苏苏、锡、常、镇一模)Time is of no importance to great thoughts, ________ are as fresh today as when they first passed through their authors' minds, ages ago.
A．what
B．that
C．which
D．where
滑升模板的优点是( )。
A．一次性投资少B．高空作业少C．节约大量模板D．耗钢量小
