搜题请搜索小程序“爱下问搜题”
问题 判断题

在冰雪道路上行车时，机动车的稳定性降低，加速过急时车轮易空转或溜滑。

答案

参考答案：对

解析：轮胎与地面的摩擦系数降低，轮胎不易附着在地面上，只要一加速，就极易空转或溜滑。

单项选择题 A3/A4型题

男，55岁，长期患有乙型肝炎。入院检查，钙为1.68mmol/L，钾为4.0mmol/L。

该患者钙浓度1.68mmol/L的原因是（）.

A.甲状旁腺功能亢进

B.血浆蛋白降低

C.维生素D中毒

D.脱水

E.肾功能不全
查看答案
单项选择题

A certain type of dinnerware made in Ganandia contains lead. Lead can leach into acidic foods, and Ganandians tend to eat highly acidic foods. However, the extreme rarity of lead poisoning in Ganandia indicates that the dinnerware does not contain dangerous amounts of lead.
Which of the following, if true, most seriously weakens the argument above

A．The dinnerware is produced exclusively for sale outside Ganandia.

B．Ganandian foods typically are much more acidic than foods anywhere else in the world.

C．The only source of lead poisoning in Ganandia is lead that has leached into food.

D．Most people who use the dinnerware are not aware that it contains lead.

E．(E) Acidic foods can leach lead from dinnerware even if that dinnerware has a protective coating.
查看答案