A.2
B.4
C.1
D.3

A.\(2 + \log a\)
B.\(\dfrac{1}{2} + \log a\)
C.\(2\log a\)
D.\({\left( {\log a} \right)^2}\)

A.\({4.10^{ - 7}}C.\)
B.\( - {4.10^{ - 7}}C.\)
C.\(2,{5.10^{ - 6}}C.\)
D.\( - 2,{5.10^{ - 6}}C.\)

A.\({\omega ^2}LC = 1\)
B.\(\omega LC = R\)
C.\({\omega ^2}LC = R\)
D.\(\omega LC = 1\)

A.\(0,60 \pm 0,01{\rm{ }}\left( {\mu m} \right)\)
B.\(0,50 \pm 0,01{\rm{ }}\left( {\mu m} \right)\)
C.\(0,60 \pm 0,02{\rm{ }}\left( {\mu m} \right)\)
D.\(0,50 \pm 0,02{\rm{ }}\left( {\mu m} \right)\)

A.20.000 vòng
B.10.000 vòng
C.50 vòng
D.100 vòng

A.\(\sqrt 3 cm\)
B.\(3\sqrt 3 cm\)
C.\(4\sqrt 3 cm\)
D.\(2\sqrt 3 cm\)

A.0,5dp.
B.2dp.
C.– 0,5dp.
D.– 1dp.

A.\(220\sqrt 2 V\)
B.220V
C.\(110\sqrt 2 V\)
D.110V

A.16cm
B.10cm
C.14cm
D.12cm