制动时汽车自动向左或向右偏驶而脱离原来行驶方向的现象称为制动跑偏,其原因是()。
A.制动力过大
B.制动力过小
C.左右两侧车轮制动力不等
D.制动过急
参考答案:C
He checked out his composition again and again to make sure that no important points had been_______.[ ]
A.found out
B.run out
C.made out
D.left out
某镀锌钢管,其黑管外径为108mm,黑管壁厚为8mm,镀锌钢管比黑管增加的质量因数为1.040,该镀锌钢管每米质量应为()kg。(钢的密度为7.850g/cm3,保留小数点后两位)
A.18.88
B.20.52
C.21.34
D.22.16