新生儿寒冷损伤综合征皮肤硬肿的特点是
A.以非凹陷性水肿为主B.以凹陷性水肿为主C.以暗红色硬肿为主D.以鲜红色硬肿为主E.中间软,四周硬
参考答案:C
He _____ home until 8:00 yesterday evening. [ ]
A. went
B. goes
C. didn't go
D. doesn't go
常用场所辐射监测仪中灵敏度最高的是()
A.电离室
B.正比计数器
C.GM计数器
D.闪烁探测器
E.半导体探测器