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【多选题】
船舶保安演习和演练应________进行一次。A.
至少每月
B.
当船员25%被换成在前三个月内未参加该船演习的,开航后24小时进行
C.
至少三个月
D.
当船员25%被换成在前三个月内未参加该船演习的,船员变动后一内进行
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反馈参考答案：
举一反三
【单选题】The Electrolux Trilobite 2.0 robot vacuum cleaner ______.
A.
asks permission before moving from room to room.
B.
uses lasers to help it avoid objects.
C.
is programmable.
【单选题】听力原文：W: Did you go to the library, before or after your exam this morning? M: Before. First, I went to the library to review my lessons, and after I had my lunch, I played football before I went home....
A.
Lunch.
B.
Exam.
C.
Review his lessons.
D.
Playing football.
【单选题】What can be inferred from the passage?
A.
11 percent of boys in America smoke before their fourth grade.
B.
Nicotine is a part of cigarette.
C.
Children form. values in the fourth grade.
D.
Parents who cannot stop smoking should force their children to stay away from it.
【单选题】( )又称企业预算线,指在既定的成本和既定的生产要素价格条件下,生产者可以购买到的两种生产要素的各种不同数量组合的轨迹。
A.
无差异曲线
B.
等成本曲线
C.
等产量曲线
D.
生产可能线
【简答题】是在既定的成本和生产要素价格条件下,生产者可以购买到的两种 生产要素 的各种不同数量组合的轨迹。
【单选题】The f i re ____ for three hours before the f i re fighters arrived.
A.
had be e n burning
B.
h ad burned
C.
would have burning
D.
has been burning
【简答题】是指:在既定的成本和生产要素价格条件下,生产者可以购买到的两种生产要素的各种不同数量组合的轨迹。
【简答题】Heat the pan with some oil before stir-f__ the carrots.
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