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【单选题】
请根据以下内容回答下列各题 This task is the same as Task 1. The 5 questions or unfinished statements arenumbered 41 to 45. The United States is a democracy, which means that thecitizens run the government. Since we can' t all make the rules, we electrepresentatives--our president, vice-president, senators, congressmen,governors, and others who make the laws and govern our country based on thebeliefs of the people. These elected officials help pass laws that reflect theinterests of their constituents, the people who live within the areas theyrepresent. Since the right to choose theserepresentatives is in the hands of the people, it is very important that every-one in a community go to the polls to cast their ballots(投票). If only a few peoplevote, then the elected repre- sentatives may not truly represent the interestsof the full community. Some day you may disagree with a decisionmade by your governor, state and federal(联邦的) representa- tives, or the president. Thebest way to make your opinion known is to go to the polls and elect newofficials whom you believe will better represent you in the future. By notvoting, you are in effect giving up your right to help make changes in ourcountry. During a presidential election, whenmillions of people exercise the fight to vote, you might think that your singlevote won' t make a difference. Remember, every vote counts. Even if thecandidates you support arch' t elected, you' ve still had a hand in shaping thecountry' s future. TheUnited States is a democracy in that
A.
the government is elected by the citizens
B.
the rules and laws are made by the people
C.
what the president does is under permission ofall the citizens
D.
everyone has a right to make changes in itsfuture
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【单选题】提示标志的几何图形为( )
A.
带斜杆的圆环
B.
正三角形
C.
圆形边框
D.
矩形
【简答题】提示标志的几何图形为(............),背景为(............)色是消防设备的提示,背景为(............)色时,一般为安全通道、太平门等的提示标示。
【单选题】下面关于辐角函数说法错误的是
A.
辐角函数Argz是多值函数
B.
辐角函数Argz的支点为0和无穷远点
C.
辐角函数Argz的主值arg在复平面上处处连续
D.
辐角函数Argz可选择割线为0到无穷远点的连线
【判断题】曲柄连杆机构是往复活塞式发动机将热能转换为机械能的主要机构。
A.
正确
B.
错误
【单选题】提示标志的几何图形的颜色为( )
A.
红色
B.
黑色
C.
绿色
D.
蓝色
【简答题】与肝素相比,华法林的作用特点不包括() A、口服有效,应用方便 B、价格便宜 C、起效快 D、作用持久 E、在体外无抗凝血作用
【单选题】提示标志,以()为背景的长方几何图形,配以白色的文字和图形符号,并标明目标的方向,即构成提示标志,如消防设备提示标志等。
A.
绿色
B.
红色
C.
白色
D.
蓝色
【单选题】“源于石油,超越石油”是( )公司的企业愿景。
A.
荷兰皇家壳牌
B.
BP
C.
道达尔
D.
杜邦
【单选题】下面关于辐角函数说法错误的是
A.
辐角函数Argz的支点为0和无穷远点,割线可选择连接0到无穷远点的曲线
B.
辐角函数Argz的主值argz,在除负实轴以外的复平面上是单值函数。
C.
辐角函数的每个分支都是复平面上的连续函数
D.
辐角函数Argz可以分出无穷多个单值分支,任意两个分支之间相差2 的倍数
【单选题】下面关于辐角说法错误的是
A.
辐角函数Argz是多值函数
B.
任意非零复数都有无数多个辐角
C.
辐角函数Argz的主值argz在复平面上处处连续
D.
辐角的正切值等于y/x
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