During a period of whiteout，you should expect which of the following（）. Snowfall or blowing snow。 Lack of ability to estimate distance。 Harsh contrast between sun-illuminated snow cover and the background。 Hazy horizons with extensive mirage effect。
The design of the connecting rod large end bearing is similar to that of the mainbearings Whats the meaning of "that" in the sentence above?（） the connecting rod。 large end bearing。 the main bearing。 the desig。
代办或批量开立“一卡通”普卡的，除自动开通的功能外，只可申请开通（）。 网上支付。 文件数字证书。 移动数字证书。 POS消费功能。
简述宿主的遗传物质。
自由降落艇释放装置构件中的横担的主要作用是（）。
焦炉四大车原始配置中，（）不能进行单元自动操作。
