变压器在投运前做冲击试验是为了检验重瓦斯保护是否可靠。
参考答案:错
The pilot asked all the passengers on board to remain ______ as the plane was making a landing.
A.seat
B.seating
C.seated
D.to be seating
财务()首先体现在项目有足够的经营活动净现金流量。
A.生存能力
B.偿债能力
C.还本付息
D.可持续性