丙烯制冷压缩机停车后要开()给机体保压。
A、一段吸入电磁阀
B、二段吸入电磁阀
C、三段吸入电磁阀
D、四段吸入电磁阀
参考答案:B
以下属于按DSM-5中双相障碍分类的是()
A.双相II型障碍
B.物质/药物所致双相障碍
C.环性心境障碍
D.双相障碍混合发作
E.躯体疾病所致双相障碍
Which of the following words best describes the relationship between park officials and neighboring landowners
A.Indifferent.
B.Intimate.
C.Cooperative.
D.Disappointing.