A.
B.
C.
D.

A.
B.
C.
D.

A.Al, Mg, Na, K.
B.Al, Na, Mg, K.
C.K, Na, Mg, Al.
D.Mg, K, Na, Al.

A.dùng nước phun vào đám cháy, dùng chăn ướt.
B.dùng cát, phun nước vào đám cháy.
C.dùng đất, cát phủ kín đám cháy, dùng bình chữa cháy.
D.dùng chăn ướt, phun nước vào đám cháy.

A.CH3-O-CH3.
B.CH3-CH2-OH.
C.CH3-OH.
D.HO-CH2-CH(OH)-CH2OH.

A.Etlien.
B.Metan.
C.Cacbon đioxit.
D.Axetilen.

A.Oxi, cacbon đioxit.
B.Axit axetic, natri oxit.
C.Oxi, natri, axit axetic.
D.Natri hiđroxit, axit axetic.

A.5,75.
B.46,0.
C.23,0.
D.13,8.

A.her cake was ready
B.if her cake was ready
C.was her cake ready
D.that was her cake ready

A.Peter failed his exam
B.Peter failed his exam that
C.that Peter failed his exam
D.Peter failed his exam, that