A:when would the conference begi
B:when the conference would begi
C:when will the conference begi
D:When the conference will begi
①G→Q+NaCl ②Q+H2O→X+H2 ③Y+NaOH→G+Q+H2O ④Z+NaOH→Q+X+H2O
则G,Q,X,Y,Z这五种化合物中氯元素的化合价由低到高的顺序为( )
下列选项中,划线字注音完全正确的一项是( )
— ________. They are both too beautiful.