3GPPR4中MSCserver间的Nc接口相关接口协议可以是:()
A. BICC协议
B. SIGTRAN协议
C. SIP-T
If a four-stroke/cycle diesel engine is started by injecting air into the cylinder, the pistons receiving the charge of starting air must be()
A. on the power stroke
B. on the exhaust stroke
C. at the end of the power stroke
D. at the start of the intake stroke
对存有残余易燃易爆物品的容器,应先用水蒸气吹洗,或用()冲洗干净,并将其盖口打开。对上述容器所有连接的管道必须可靠隔绝并加装堵板后,方准许焊接。
A. 热碱水
B. 热酸水
C. 热水
D. 冷碱水