【单选题】化合物 的系统命名法名称是
A.
4- 甲基二环 [2.2.2] -1- 辛烯
B.
5- 甲基二环 [2.2.2] -2- 辛烯
C.
2- 甲基二环 [2.2.2] -5- 辛烯
D.
3- 甲基二环 [2.2.2] -5- 辛烯
【单选题】化合物 的系统命名法名称是
A.
(Z)‐3‐ 甲基 ‐4‐ 异丙基 ‐3‐ 庚烯 ‐6‐ 炔
B.
(Z)‐4‐ 异丙基 5‐ 甲基 ‐4‐ 庚烯 ‐1‐ 炔
C.
(Z)‐5‐ 甲基 ‐4‐ 异丙基 ‐4‐ 庚烯 ‐1‐ 炔
【单选题】When the author says robots are still pretty dumb, he means______.
A.
robots have not yet possessed sense of touch
B.
robots still cannot read
C.
there are still many things robots cannot do
D.
humans are no match for robots
【判断题】As Mary's violin was old and wothless, she sold it only for seven dollars.
【单选题】defeated,he was 38 aheadof me.
【判断题】As Mary's violin was old and worthless, she sold it only for seven dollars
【简答题】Is he still working? Yes, he_________( still work ) now and he ________ ( not finish) yet.