【单选题】The reason why the electric eel is able to give more powerful shock is that ______.
A.
the working system of the electric plates in the eel is the most effective
B.
the working system of the electric plates in the eel is far inferior to those in the torpedo
C.
compared with those in the torpedo, the working system of, electric plates in the eel is more direct and efficient
D.
compared with other electric fish, the eel possesses much more electric plates
【简答题】(本小题满分12分) 某人向一目标射击,在 处射击一次击中目标的概率为 ,击中目标得2分;在 处射击一次击中目标的概率为 ,击中目标得1分.若他射击三次,第一次在 处射击,后两次都在 处射击,用 表示他3次射击后得的总分,其分布列为: ⑴求 及的数学期望 ; ⑵求此人3次都选择在 处向目标射击且得分高于2分的概率.
【单选题】When the powerful earthquake struck and all lights went out all of a sudden. It seemed _______ the world was at an end.
【简答题】锅水和给水防垢处理的目的有何不同?分别说明炉内处理和炉外处理采取的措施。
【单选题】对军官的处分项目中,最轻的为( )处分。
【多选题】中标人将中标项目的关键工作分包给他人的法律后果是( )