A.\(3\)
B.\(1\)
C.\(0\)
D.\(2\)

A.\(2\pi {a^2}\)
B.\(3\pi {a^2}\)
C.\(\pi {a^2}\)
D.\(4\pi {a^2}\)

A.\(\dfrac{\pi }{6}\)
B.\(\dfrac{\pi }{4}\)
C.\(\arctan \sqrt 2 \)
D.\(\arctan 2\)

A.\({V_{S.BCD}} = 4{a^3}\)
B.\({V_{S.BCD}} = 2{a^3}\)
C.\({V_{S.BCD}} = \dfrac{{2{a^3}}}{3}\)
D.\({V_{S.BCD}} = \dfrac{{4{a^3}}}{3}\)

A.\(3\sqrt 2 \)
B.\(10\)
C.\(\sqrt {10} \)
D.\(18\)

A.\(A =  - \dfrac{{10}}{3}\)
B.\(A =  - 1\)
C.\(A = 1\)
D.\(A =  - \dfrac{5}{3}\)

A.\({\left( {x + 1} \right)^2} + {\left( {y + 3} \right)^2} + {\left( {z + 2} \right)^2} = 9\)
B.\({\left( {x - 1} \right)^2} + {\left( {y - 3} \right)^2} + {\left( {z - 2} \right)^2} = 9\)
C.\({\left( {x + 1} \right)^2} + {\left( {y - 3} \right)^2} + {\left( {z - 2} \right)^2} = 9\)
D.\({\left( {x - 1} \right)^2} + {\left( {y + 3} \right)^2} + {\left( {z - 2} \right)^2} = 9\)

A.\(\dfrac{{4\pi {a^3}}}{3}\)
B.\(\dfrac{{7\pi {a^3}}}{3}\)
C.\(\dfrac{{7\pi {a^3}}}{9}\)
D.\(4\pi {a^3}\)

A.\(\dfrac{1}{{15}}\)
B.\(\dfrac{7}{{162}}\)
C.\(\dfrac{5}{{162}}\)
D.\(\dfrac{7}{{405}}\)

A.“Giảm tô, giảm thuế”.
B.“Đánh đuổi phát xít Nhật”.
C.“Cách mạng ruộng đất”.
D.“Chống phát xít, chống chiến tranh”.