【判断题】实验室内应使用空气开关并配备必要的漏电保护器;电气设备和大型仪器须接地良好;电气设备应配备足够的用电功率和电线,不得超负荷用电;对电线老化等隐患要定期检查并及时排除。
【判断题】ball中的字母可以组成含有4个元素的集合
【单选题】Why are mischief makers called 'Black Hats'?
A.
Because they wear black hats.
B.
Because they act in a dishonest way.
C.
Because they are magicians.
D.
Because they appear in the night.
【多选题】哌替啶的作用特点,正确的是( )
A.
镇静、呼吸抑制、致欣快、扩血管作用与吗啡相当
【判断题】It is safe to wear black suits and middle-heeled shoes for female candidates in an interview.()
【单选题】能效等级中 级表示产品达到国际先进水平、最节电、耗能最低。