A.It constantly runs through the various blood vessels of the body
B.It is the basis upon which the method of acupuncture was devised
C.It is an invisible force that blocks the pathways of the body
D.It stimulates certain pathways in the body and relieves pain

A.basis
B.relief
C.symptom
D.application

A.basis
B.relief
C.symptom
D.application

A.By writing novels
B.By working at a railway station
C.By getting a medal
D.By teaching foreign languages

A.sport
B.1932 Olympics
C.gold medals
D.Summer Olympics

A.\(y =  - {x^3} + {x^2} - 1\).
B.\(y = {x^4} - {x^2} - 1\).
C.\(y = {x^3} - {x^2} - 1\).
D.\(y =  - {x^4} + {x^2} - 1\).

A.\(I = \dfrac{1}{2}\)
B.\(I = 0\)
C.\(I = -2\)
D.\(I = 2\)

A.\(\left\{ \begin{array}{l}x = 1 + 3t\\y = 3t\\z = 1 - t\end{array} \right.\).
B.\(\left\{ \begin{array}{l}x = 1 + t\\y = 3t\\z = 1 - t\end{array} \right.\).
C.\(\left\{ \begin{array}{l}x = 1 + t\\y = 1 + 3t\\z = 1 - t\end{array} \right.\)
D.\(\left\{ \begin{array}{l}x = 1 + 3t\\y = 3t\\z = 1 + t\end{array} \right.\)

A.\(3x - 2y + z + 12 = 0\) 
B.\(3x + 2y + z - 8 = 0\)
C.\(3x - 2y + z - 12 = 0\) 
D.\(x - 2y + 3z + 3 = 0\)

A.4 mặt phẳng.  
B.3 mặt phẳng.  
C.6 mặt phẳng.
D.9 mặt phẳng.