A. (CH)CHCOOH; B. CHCHClCOOEt; CHCH(COOEt); D. (CH)CHOH。
A. Cl—C+HCHCH; B. C+HCHCHCH; CFC+HCHCH; D. CHOC+HCHCH。
A B C D
A. CB2000 B. NOVA1.0 C. NOVA1.2 D. NOVA1.3