分馏法原油稳定装置中,当()长时间液位过高,易造成淹塔事故。
A.三相分离器
B.轻烃罐
C.原油缓冲罐
D.稳定塔
参考答案:D
If they win the final tonight, the team are going to tour around the city ______by their enthusiastic supporters.
A.being cheered
B.be cheered
C.To be cheered
D.Were cheered
一袋中装有大小相同的3个红球,4个黑球,C现从中随机取出4个球.
(Ⅰ)求取出的红球数X的概率分布列和数学期望;
(Ⅱ)若取出一个红球得2分,取出一个黑球得1分,求得分不超过5分的概率.