He often _____ some good presents on his birthday. [ ]
A. makes
B. gets
C. sends
D. buy
答案:B
一氧化碳中毒
A.深昏迷,口唇呈樱桃红色B.瞳孔缩小,出汗流涎C.瞳孔扩大,谵妄幻觉D.深昏迷,瞳孔时大时小E.昏迷伴肌纤维颤动
通用式机车信号点灯继电器采用8个高可靠小型继电器,每个继电器有2组接点,使用电源为()V。
A.12
B.5
C.24
D.50