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【简答题】
设曲线C的参数方程为 (t为参数),若以直角坐标系的原点为极点,x轴的正半轴为极轴建立极坐标系,则曲线C的极坐标方程为____.
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举一反三
【简答题】Plastic and traces of hazardous chemicals have been found in Antarctica, one of the world’s last great wildernesses, according to a new study. Researchers spent three months taking water and snow samp...
【单选题】To label their produce as organic, farmers have to obtain a certificate showing that no ________ chemicals have been used to kill pests on the farm for two years.
A.
toxic
B.
tragic
C.
nominal
D.
notorious
【简答题】This report ranks 50 appliance manufacturers selected according to their volume of sales.//The total turnover of the yzed companies is worth around EUR 587 billion, including EUR 125 billion of th...
【单选题】To lable their product as organic ,famers have to obtain a certificate showing that no ______chemicals have been used to kill pests on the farm for two years.
A.
tragic
B.
toxic
C.
notorious
D.
nominal
【单选题】关于以下程序段,下面的说法正确的是() char result; scanf ("%c",&result); switch(result) { case 'A': case 'B': printf ("Good!\n"); break; case 'E': printf ("Bad!\n"); default: printf ("Error!\n"); }
A.
执行程序段后，输入a或者b，都将输出Good!
B.
执行程序段后，输入A或者B或者C，都将输出Good!
C.
执行程序段后，输入E，将输出Bad!，然后结束
D.
执行程序段后，输入C，将输出 Error!
【单选题】关于以下程序段,下面的说法正确的是________。
A.
执行程序段后，输入a或者b，都将输出Good!
B.
执行程序段后，输入A或者B或者C，都将输出Good!
C.
执行程序段后，输入E，将输出Bad!，然后结束
D.
执行程序段后，输入C，将输出 Error!
【单选题】The roots of plants()chemicals that have been absorbed and turn them into food for the plants.
A.
break out
B.
break into
C.
break down
【简答题】The roots of plants ( ) chemicals that have been absorbed and turn them into food for the plants.
【单选题】According to IEA 2019 report, a lthough ( ) ranks tenth in oil reserve, it is the highest oil producing country and the highest oil consuming country.
A.
Russia
B.
Saudi Arabia
C.
USA
D.
China
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