H<sub>2</sub>C=C=CH<sub>2</sub>所属的点群是下列的哪一种?() 
A、D2
B、D2h
C、D2d
D、C2hv
A、D2
B、D2h
C、D2d
D、C2hv
A、C<sub>6sub>H<sub>5sub>CH<sub>2sub>CO<sub>2sub>H B、CH<sub>3sub>CH<sub>2sub>CO<sub>2sub>H C、BrCH<sub>2sub>CH<sub>2sub>CO<sub>2sub>H D、C<sub>1sub>CH<sub>2sub>CH<sub>2sub>CO<sub>2sub>H
A、CH<sub>3sub>CH=C=CHCH<sub>3sub> B、CH<sub>3sub>CH=CH(CH<sub>2sub>)<sub>3sub>CH=CH<sub>2sub> C、CH<sub>2sub>=CH-CH=C(CH<sub>3sub>)–C<sub>2sub>H<sub>5sub> D、CH<sub>2sub>=CHCH<sub>2sub>CH(C<sub>2sub>H<sub>5sub>)CH<sub>2sub>CH=CH<sub>2sub>
A、(CH<sub>3sub>)<sub>3sub>CCO<sub>2sub>C<sub>2sub>H<sub>5sub> B、(CH<sub>3sub>)<sub>2sub>CHCO<sub>2sub>C<sub>2sub>H<sub>5sub> C、CH<sub>3sub>CH<sub>2sub>CH<sub>2sub>CO<sub>2sub>C<sub>2sub>H<sub>5sub> D、CH<sub>3sub>CO<sub>2sub>C<sub>2sub>H<sub>5sub>
A、CH<sub>3sub>CH=C=CHCH<sub>3sub> B、CH<sub>3sub>CH=CHCH=CH<sub>2sub> C、CH<sub>2sub>=CH-CH=C(CH<sub>3sub>)–C<sub>2sub>H<sub>5sub> D、CH<sub>2sub>=CHCH<sub>2sub>CH(C<sub>2sub>H<sub>5sub>)CH<sub>2sub>CH=CH<sub>2sub>
A、CH<sub>4sub>、CO、C<sub>2sub>H<sub>4sub>、C<sub>2sub>H<sub>6sub> B、CH<sub>4sub>、CO、C<sub>2sub>H<sub>4sub>、C<sub>2sub>H<sub>6sub>、C<sub>2sub>H<sub>2sub> C、CH<sub>4sub>、C<sub>2sub>H<sub>2sub>、C<sub>2sub>H<sub>4sub>、C<sub>2sub>H<sub>6sub> D、CO、CO<sub>2sub>、H<sub>2sub>、CH<sub>4sub>、C<sub>2sub>H<sub>4sub>、C<sub>2sub>H<sub>6sub>
A、CO、H<sub>2sub>、CH<sub>4sub>、N<sub>2sub> B、Ar<sub>2sub>、CH<sub>4sub>、N<sub>2sub>、H<sub>2sub>、NH<sub>3sub> C、NH<sub>3sub>、CH<sub>4sub>、N<sub>2sub>、CO<sub>2sub> D、H<sub>2sub>O、N<sub>2sub>、H<sub>2sub>、CH<sub>4sub>
A、HO[-OC(CH<sub>2sub>)<sub>5sub>NHOC(CH<sub>2sub>)5NH-]<sub>nsub>H; B、H[-NHOC(CH<sub>2sub>)5-]<sub>nsub> NH<sub>2sub>; C、HO[-OC(CH<sub>2sub>)<sub>5sub>NH-]<sub>nsub> H; D、H[-OOC(CH<sub>2sub>)<sub>5sub>NH-]<sub>nsub> H
A、H(CH<sub>2sub>)<sub>nsub>X B、CH<sub>3sub>—[CH<sub>2sub>]<sub>nsub>—CH<sub>3sub> C、H-(CH<sub>2sub>)<sub>5sub>—X D、C<sub>nsub>H<sub>2sub><sub>nsub>
A、CH<sub>2sub>=CH(CH<sub>2sub>)<sub>4sub>Cl B、CH<sub>3sub>(CH<sub>2sub>)<sub>4sub>Cl C、C<sub>6sub>H<sub>5sub>-CH<sub>2sub>CH<sub>2sub>Cl D、C<sub>6sub>H<sub>5sub>-Cl
A、CO+2H<sub>2sub> = CH<sub>3sub>OH+Q;CO<sub>2sub>+3H<sub>2sub>= CH<sub>3sub>OH+H<sub>2sub>O+Q B、CO+H<sub>2sub>O = CO<sub>2sub>+H<sub>2sub>;4CO+8H<sub>2sub> = C<sub>4sub>H<sub>9sub>OH+3H<sub>2sub>O C、CO+3H<sub>2sub> = CH<sub>4sub>+H<sub>2sub>O+Q ;CO<sub>2sub>+4H<sub>2sub> = CH<sub>4sub>+2H<sub>2sub>O+Q D、CO+2H<sub>2sub> = CH<sub>4sub>+Q;CO<sub>2sub>+3H<sub>2sub> = CH<sub>4sub>+H<sub>2sub>O+Q