【单选题】化合物 CH 2 =CHCH(CH 3 )CH(CH 3 )CHO 的正确命名为
【单选题】下列化合物中,吸收波长最长的化合物是( )。
B.
(CH2)2C=CHCH2CH2CH=C(CH3)2
【简答题】Mr. Black often _____
fishing on Sundays, _____ he ?A. goes; doesn't B. goes; isn't C. doesn't go; does D. doesn't go; is
【单选题】低电压继电器反应电压降低而动作,能够使继电器开始动作的最大电压称为低电压继电器的()。
【判断题】(判断)二氧化钛和氧化铁的混合物或者钌化合物能帮助水在阳光下分解的催化剂。
【单选题】Mr. Black often gives us ________ by Email.
C.
some good informations
【单选题】Mr. Black often _____ a bus to the factory
【单选题】Mr. Black often gives us ________ by Email. [ ]
B.
some good informations