本质安全型防爆电气设备是指在()状态下产生的电火花或表面温度不能引起爆炸性气体混合物爆炸的电气设备。
A、一般
B、工作
C、正常
D、正常或故障
参考答案:D
The positive meanings words in an ad and how they are presented in an interesting way play an important role in promoting a product.
A.are attached to
B.attached to
C.attaching to
D.having attached to
以下哪种脏器损伤后,对腹膜刺激性较小,腹膜刺激征较轻()。
A.胰腺损伤
B.十二指肠损伤
C.脾破裂
D.胃损伤
E.结肠损伤