肺气肿患者最通常的主诉是（） A.胸骨后疼痛 B.发热和咳痰 C.咳嗽、咳痰、呼吸困

对有急、险病情的患者，医生不在场时，护士应当( )

A．密切观察
B．催促医生
C．采取力所能及的急救措施
D．做好抢救准备

She tried _____ Chinese in English class.[ ]

A. to not speak

B. not to speak

C. not speaking

D. didn't to speak

The Science Museum, _____ we visited during a recent trip to Britain, is one of London@^@^@s tourist attractions. [ ]

A. which

B. what

C. that

D. where

正常小儿开始能随物品或声音转动头部是（）

A.3个月

B.4个月

C.5个月

D.6个月

E.7个月

海绵状血管瘤在CT和MRI上的表现特点有（）

A.可发生在脑外或脑内

B.有明显占位效应

C.可合并出血

D.常伴钙化

E.在MRI的T2加权像上常有一低信号环