某单位有3名职工和6名实习生需要被分配到A、B、C三个地区进行锻炼，每个地区分配1名职工和2名实习生，则不同的分配方案有多少种？()
A. 90
B. 180
C. 270
D. 540
查看答案
接触网距机车车辆或装载货物的距离不能少于()删。
A. 300
B. 350
C. 400
D. 500
According to Dr. Nicholas A. Christakis, what is the explanation for friends being the greatest influence？
A. Friends usually spend a lot of time together.
B. Friends share similar eating habits.
C. Friends are more important than family members.
D. Friends affected each others' feelings of fatness.
【B2】
A. Some
B. Many
C. Even
D. Still
A．uselessB．impossibleC．inappropriateD．unnecessary
A. useless
B. impossible
C. inappropriate
D. unnecessary
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