单选题
发布日期:2021-03-22
Closer to the coast
Farther from the coast
On the track line ahead of the fix
On the track line behind the fix
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若要获得当前正在执行的脚本所在页面的虚拟路径,以下用法中,正确的是()。
在对投资方案进行经济效益评价时,下列五个方案中可以接受的方案有()。
以货物的载运方式划分,国际贸易分为()。
1岁小儿,标准体重、身长是,体重______(kg),身长______(cm)。( )
当-5≤x≤0时,的最大值是____,最小值是____.
某干燥器的操作压强为79.98kPa,出口气体的温度为60℃,相对湿度70%,将部分出口气体返回干燥器入口与新鲜空气相结合,使进入干燥器的气体温度不超过90℃,相对湿度为12%。已知新鲜空气的质量流量为0.5025kg/s,温度为20℃,湿度为0.005kg水/kg干空气,试求: 1)新鲜空气的预热温度及空气的循环量; 2)预热器需提供的热量为多少?若将流程改为先混合后预热,所需热量是否有变化?
民事诉讼中,必要的共同诉讼的特点是()。
苹果短枝型品种、中国梨的多数品种表现萌芽率高而成枝力弱,长枝少、短枝多,修剪时应少()、多(),保持一定的长枝数量以防树势衰弱。
下丘脑从前向后可分为()、()、()和()4个部分。
逆流止回阀50的作用是什么?
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