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问题 选择题
如图所示，把一反射面向上的凹镜置于容器内，有一束平行光线以凹镜反射后会聚在A点，如果向容器内加一些水，将凹镜恰好浸没在水中，则该光束的会聚点A的位置将（　　）

A．向下移动一些

B．保持不变

C．向上移动一些

D．与水的浓度有关，无法判断

答案

答案：A

单项选择题

None of the people on your 15 person project team have worked together before, and it really shows. The team cannot seem to get past the storming stage: each meeting is characterized by disagreements, debates, and long-winded expositions some of the more verbose members of the group. Everyone seems to speak a different “language” even though they are all from the same country. Conflicts are rampant. You need to get this situation under control quickly. Therefore, the first action you should take is to______.

A．hold periodic group meetings

B．use a group facilitator at the next meeting

C．perform careful project planning

D．enforce strict rules about meeting behavior
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问答题 简答题

地下水按条件可分为哪三大类？按含水层空隙性质可分为哪三个亚类？
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