【单选题】下列化合物按官能团分类属于醇的是: ① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑨
【单选题】官能团是决定有机化合物的化学性质的原子或原子团,醇类中含有()官能团。
【单选题】下列说法正确的是( )
C.
醇类和酚类具有相同的官能团,因而具有相同的化学性质
【单选题】Which of the following is NOT the Second Officer’s responsibility?
A.
The Second Officer is responsible for the maintenance of communication equipment.
B.
The Second Officer is responsible for making voyage plan.
C.
The Second Officer carries out appropriate stock control.
D.
The Second Officer also acts as a ship’s Safety Officer.
【简答题】iii.
On the second slide, the students are planning toA. Explain why mobile phones are erous B. Point out some different kinds of risks C. Mention ways to avoid the risks
【单选题】《______》的出现,标志着茶从“荼”字演化为“茶”字。
【单选题】增加细胞外液 中的 Na + 浓度,将使神经细胞动作电位的超射值()
【判断题】抗洪抢险时,堤内坡出现“出汗”式渗水时,可在堤内坡面开沟导渗,让渗水集中在沟内流走,沟内填压粘土,并盖草袋压土。