【简答题】求未知数x: 2 3 x+ 1 2 x=42 0.75 1.5 =x:6.
【简答题】根据物理量性质来分,浓度场属于_________________ 。
【简答题】求未知数x. x+0.8=1.7 8:x=3:6.
【单选题】请根据短文的内容,回答题。 Common-cold Sense You can&39;t beat it, but you don&39;t have to join it. Maybe it got the name "common cold" because it&39;s more common in winter. The fact is, though, being cold doesn...
A.
the weather is too cold
B.
the spread of rhinoviruses gets people infected
C.
another person's coughing passes the cold to you
D.
you wash your hands too often
【判断题】根据物理量的性质来分,浓度场属于数量场。 ( )
【简答题】求比值 ①2.1:2.7 ② 9 8 :3 ③ 3 4 : 1 12 ④45:6.
【简答题】已知x a =2,x b =6. (1)求x a-b 的值. (2)求x 2a-b 的值.
【判断题】对耐油胶管选用橡胶的原则,应是与输送油类的溶解度参数差距愈小愈好。