搏动性头痛多为( )
A．颅内占位性病变B．三叉神经痛C．血管性头痛D．颅内感染E．青光眼性疼痛
参考答案：C
It is a good idea to ask for a map at the information center,_____ may prove to be very useful,
Before you start your tour of the museum. [ ]
A. where
B. which
C. who
D. that
苯胺加氢反应时控制的工艺指标是多少？
