关于等高线的特点描述,以下不正确的有() ["等高距相等时,等高线越密,地面坡度越陡","等高距相等时,等高线越密,地面坡度越缓","一般情况下,等高线为闭合曲线","任何情况下,等高线为闭合曲"]
储气设施按储存压力、密封方式及结构形式分()、常压储气。 ["高压储气","中压储气","低压储气罐","超高压储气罐"]
当用温度计法测量电动机滚动轴承温度超过()℃,滑动轴承超过()℃时,就是轴承过热。 ["80,90","85,90","95,80","80,93"]
在主机油总油道和活塞冷却喷嘴总油道之间安装有()。 ["逆止阀","顺序阀","旁通阀","切断阀"]
G3520C燃气发动机的机油耗量为()g/ekW-hr。 ["0.21","0.31","0.41","0.27"]
坡道上某桩号高程为147.27m,改正数y=0.14m,如为凸竖线,则曲线上此桩号高程为()如为凹竖曲线则曲线上此桩号高程为()。